How Does the Penis Change With Age - and What Can Men Do About It?

[madman]

Curated By Nelson Vergel | ExcelMale.com | Updated May 2026

Most men assume their penis will stay exactly as they remember it from their 20s. Then, somewhere in their 40s or 50s, things start to feel different. The erections are not quite as firm, morning wood has become less reliable, and a slight curve appears that was not there before. A smaller number discover their penis has actually shortened over time - not dramatically, but enough to notice. These changes are real, they are common, and they are largely preventable with the right approach.
This article covers the physical changes that happen to the penis with age, what drives them biologically, and what men can do to slow or reverse them - including the role of regular sexual activity, daily tadalafil, masturbation frequency, and prostate health. Much of this is information that men are rarely taught, even by their doctors.

Key Takeaways

• The penis can lose length and girth over time when erections are infrequent - use it or lose it is real.

• Penile fracture is more common than many men realize; partners should also understand the risks.

• Peyronie's disease (scar tissue causing curvature) affects up to 1 in 9 men and is frequently underdiagnosed.

• Daily low-dose tadalafil (2.5-5 mg) supports penile oxygenation, preserves length, and promotes nocturnal erections.

• Men who ejaculate 21 or more times per month show a 20-31% lower risk of prostate cancer in large cohort studies.

• Masturbation frequency is a personal variable - there is no clinically recommended minimum, but sexual inactivity carries measurable penile health costs.

• Regular erections - whether from sex, masturbation, or nocturnal tumescence - are essential for oxygenating penile tissue.

What Physical Changes Happen to the Penis as Men Age?​

The penis is not a static organ. It is composed of smooth muscle, fibrous tissue, blood vessels, and nerves - all of which respond to the same aging processes that affect the rest of the cardiovascular system. There are several changes men may notice over time.

Does the Penis Actually Shrink With Age?​

Yes - and this is one of the least-discussed facts in men's health. When erections become infrequent, the smooth muscle tissue inside the corpora cavernosa (the chambers that fill with blood during an erection) can undergo fibrosis, meaning scar tissue slowly replaces healthy, elastic tissue. Fibrotic tissue does not stretch. Over time, this reduces both length and girth.
Board-certified urologist Dr. Amy Pearlman explains the mechanism directly: "When someone is not getting regular erections like daily erections, the penis can shrink in both length and girth." She notes this is why she prescribes daily tadalafil to some patients even when they are not sexually active - to maintain the mechanical stretching of penile tissue that prevents this fibrosis from progressing.
The biology behind this is well established. Nocturnal penile tumescence (NPT) - the natural erections men get during REM sleep - serves a critical physiological function. These nighttime erections oxygenate penile tissue and counteract the hypoxia (low oxygen) that drives smooth muscle loss and fibrosis. Men who do not achieve adequate NPT are quietly losing penile tissue health, often without any awareness.

Why Does Penile Curvature Develop After 40?​

A distinct condition called Peyronie's disease (PD) affects up to 1 in 9 men in the United States, and may be considerably underdiagnosed because many men never report it. PD is a disorder of wound healing in the tunica albuginea - the tough fibrous sheath surrounding the erectile chambers. After micro-traumas during intercourse (which accumulate over a lifetime), some men develop abnormal scar tissue called plaque. Plaque does not stretch like healthy tissue, so it creates a bend during erection.
As Dr. Pearlman puts it, "the penis is essentially in a boxing ring." Even standard, non-aggressive intercourse creates microtraumatic events. Most men with PD cannot identify a single dramatic injury - the damage is cumulative and largely invisible until the curve appears.
Curvature under 20 degrees typically does not interfere with sexual function. Above 30 degrees, it can cause pain, penetration difficulties, or psychological distress. Dorsal curvature (the penis bending toward the abdomen) is the most common form, and for some men it actually improves certain angles during intercourse - but for others it becomes a significant quality-of-life problem.
PD is more common in men over 50, in men with diabetes, and in those with Dupuytren's disease (a connective tissue disorder of the hand). It is not caused by a sexually transmitted infection, and it is not contagious.

Can Normal Aging Cause Curvature Even Without Peyronie's Disease?​

Yes. Congenital curvature - curve present since birth or early adulthood - is very common and generally benign. Most men do not have perfectly straight penises, and mild lateral or dorsal curvature is a normal anatomical variation. This differs from PD in that there is no active scar tissue formation, no pain, and no progression over time.
The key clinical question is whether curvature causes pain during intercourse, prevents penetration, or is worsening. If the answer is no to all three, observation is typically appropriate. If the curvature is progressing, painful, or causing distress, evaluation by a urologist with experience in sexual medicine is warranted.

Table 1: Congenital Curvature vs. Peyronie's Disease - Key Differences

Feature​	Congenital Curvature​	Peyronie's Disease​
Age of onset	Present at birth or puberty	Develops in 40s-60s most commonly
Cause	Structural variation	Fibrotic plaque after micro-trauma
Progression	Stable	Often progresses in acute phase
Pain	Rarely	Common in acute phase
Palpable plaque	No	Yes, often detectable
Treatment needed	Only if functionally limiting	Medical or surgical if symptomatic

What Is Penile Fracture and How Can Men Prevent It?​

Penile fracture is more common than its rarity in conversation would suggest. Despite the common phrase "boner," there is no bone in the penis - but there is a dense fibrous sheath called the tunica albuginea, and it can tear. A penile fracture occurs when a sudden force - often during vigorous intercourse, particularly when the penis slips out and strikes the perineum or pubic bone - causes a rupture in this sheath.
Signs include a popping sound, sudden loss of erection, immediate pain, rapid swelling, and bruising. This is a urological emergency and requires prompt evaluation. Untreated penile fracture can lead to permanent scarring, long-term curvature, and erectile dysfunction. Dr. Pearlman is explicit about this: "You have to have sex safely. You want to come in prepared... you have to be careful with your penis."

Which Sexual Positions Carry the Highest Risk of Penile Fracture?​

Research suggests that woman-on-top (partner-superior) intercourse accounts for a disproportionate share of penile fracture cases, as the partner controls angle and force and the man has less ability to adjust trajectory when the angle becomes unfavorable. Rear-entry positions are also associated with elevated risk. Lateral (side-lying) positions appear to carry lower risk.
The common mechanism is the penis "missing" the intended entry and striking the perineum or pubic bone at high force. Partners should be aware that they share responsibility for penile safety - a point that rarely appears in standard sex education. Slowing down when changing positions and maintaining awareness of penile angle during active movement are practical preventive steps.

How Does Daily Tadalafil Help Preserve Penile Health Over Time?​

Tadalafil (the active ingredient in Cialis) is a PDE5 inhibitor most commonly prescribed for erectile dysfunction. But for men focused on long-term penile health, its role goes well beyond treating acute ED. Daily low-dose tadalafil - typically 2.5 mg to 5 mg - is emerging as a maintenance tool that supports penile tissue health even in men without significant ED.

What Does the Research Show About Tadalafil and Penile Length Preservation?​

The most compelling clinical data on this question comes from the post-prostatectomy rehabilitation literature. In a randomized, double-blind, placebo-controlled trial (the REACTT trial), men who received once-daily tadalafil after nerve-sparing radical prostatectomy experienced significantly less penile length loss compared to both the on-demand tadalafil group and the placebo group at 13.5 months of follow-up.
A related study found that daily tadalafil users lost only 2.2 mm of penile length over 9 months, compared to 7.9 mm in the on-demand group and 6.3 mm in the placebo group. While these studies were conducted in a surgically altered population, the underlying mechanism - PDE5 inhibition reducing cavernosal fibrosis and hypoxia - applies broadly to aging men with declining nocturnal erections.
The mechanism is straightforward: tadalafil increases cyclic GMP levels, which relaxes smooth muscle in the corpus cavernosum and increases blood flow. Repeated penile engorgement oxygenates the tissue, prevents fibrosis, and maintains the structural integrity of the smooth muscle needed for future erections. Daily dosing creates a constant low-level effect that supports nocturnal erections throughout the night - something on-demand dosing does not replicate.

What Dose of Daily Tadalafil Is Appropriate for Penile Health Maintenance?​

In clinical practice, 2.5 mg to 5 mg daily is the standard starting range for penile maintenance purposes. The ExcelMale community has extensive experience with this dosing approach, with many men reporting that 5 mg nightly is effective for restoring nocturnal erections and improving the quality of morning erections. Some older men or those with more significant vascular compromise move to 7.5-10 mg daily under physician guidance.
Tadalafil is generally well-tolerated at these doses. Common side effects include mild headache, nasal congestion, and flushing, which typically diminish with continued use. Men on nitrates (for heart disease) should not take PDE5 inhibitors. Generic tadalafil is now widely available and affordable, making this a cost-accessible intervention for most men.

Table 2: Daily Tadalafil Dosing Overview for Penile Health Maintenance

Dose​	Primary Use​	Notes​
2.5 mg/day	Maintenance, mild ED, starting dose	Lowest approved daily dose; good for penile oxygenation
5 mg/day	Standard maintenance, moderate ED	Most commonly used daily dose; strong NPT support
5 mg BPH indication	Approved for BPH + ED simultaneously	FDA-approved dual indication
7.5-10 mg/day	Moderate-severe ED; older or vascular patients	Off-label split dosing; discuss with physician

How Often Should Men Ejaculate for Optimal Prostate and Sexual Health?​

The question of ejaculation frequency sits at the intersection of prostate oncology, sexual medicine, and personal lifestyle - and the evidence, while not definitive, is worth understanding.

What Does the Harvard Research on Ejaculation and Prostate Cancer Show?​

The most widely cited evidence comes from the Health Professionals Follow-up Study, a large prospective cohort of nearly 32,000 men tracked over 18 years. Published in European Urology, the study found that men who ejaculated 21 or more times per month during their 20s or 40s had a 19-22% lower risk of prostate cancer diagnosis compared to men ejaculating 4-7 times per month, after adjustment for lifestyle confounders.
An earlier publication from the same cohort (in JAMA) found an even stronger association - up to 50% lower risk - though the later, longer-term analysis settled on the more modest 19-22% figure. A complementary Australian study found that men averaging 4.6-7 ejaculations per week were 36% less likely to be diagnosed with prostate cancer before age 70 than men ejaculating fewer than 2.3 times per week.
The biological mechanism behind this association is not fully confirmed. Leading theories include the "prostate stagnation" hypothesis (infrequent ejaculation allows potentially carcinogenic substances to accumulate in prostatic ducts), hormonal flushing, and reduced chronic inflammation. What is clear is that frequent ejaculation does not cause harm and almost certainly offers some benefit, particularly for low-risk prostate disease.

Does It Matter Whether the Ejaculation Comes From Sex or Masturbation?​

No. The Harvard study tracked total ejaculations - whether from intercourse, masturbation, or nocturnal emission. The protective effect appears tied to ejaculation itself, not to its context. This is clinically important because it removes the myth that masturbation is somehow less "beneficial" than partnered sex for prostate health purposes.
Dr. Pearlman notes that masturbation serves multiple health functions beyond prostate protection: it maintains penile tissue health through regular engorgement, provides a stress-regulation mechanism, and is part of a broader pattern of sexual self-awareness that benefits long-term sexual function. A patient she describes who uses masturbation as a healthy sleep and stress-regulation tool is not an outlier - research consistently shows masturbation is positively associated with sexual satisfaction and general wellbeing.

Is There Such a Thing as Too Much Masturbation?​

The clinical literature does not support a specific frequency ceiling for healthy men. "There is no evidence to support people not masturbating," Dr. Pearlman notes. The fringe concept of "dopamine fasting" or extended abstinence from masturbation has no peer-reviewed evidence base, and there is no demonstrated health benefit to prolonged sexual abstinence in otherwise healthy men.
The main clinical caveat involves training effects. Dr. Pearlman describes a pattern she sees clinically: men who consistently train their bodies to take 45 minutes to reach orgasm during solo activity may later find it difficult to reach climax in 10-15 minutes with a partner. The takeaway is flexibility - varying the conditions and time frames of masturbation to maintain adaptability in real-world sexual situations.
Masturbation also becomes a concern in the context of pornography-induced sexual dysfunction, where men condition their arousal primarily to high-stimulation screen content and subsequently find arousal with partners insufficient. This is a behavioral conditioning issue, not a function of masturbation frequency per se.

Table 3: Ejaculation Frequency - What the Evidence Suggests

Frequency​	Prostate Cancer Risk​	Penile Health Notes​
Less than 4x/month	Higher relative risk (reference group in studies)	Infrequent erections increase fibrosis risk
4-7x/month	Baseline comparison group in Harvard study	Minimum adequate for most men's penile oxygenation
8-20x/month	Incrementally reduced risk	Generally beneficial; maintains penile health
21+ x/month	19-31% lower prostate cancer risk vs. 4-7x	Consistent tissue oxygenation; no downside identified

When Should a Man See a Urologist About Penile Changes?​

Many men delay seeking evaluation for penile changes because they assume the changes are inevitable, or because the topic feels embarrassing. Dr. Pearlman's advice is direct: "If you're worried and you need peace of mind, that is reason enough to schedule a visit."
There are specific signs that warrant prompt evaluation rather than watchful waiting:
• Penile curvature that is new, worsening, or causing pain during erections
• Sudden penile pain with bruising or swelling after intercourse (possible penile fracture - seek same-day evaluation)
• Noticeable loss of penile length or girth that is not explained by weight gain
• Consistent absence of morning erections for more than a few weeks
• Difficulty achieving or maintaining erections that represents a change from a prior baseline
• A lump, bump, or skin change on the penis that does not resolve in a few days
Not all urologists are equally equipped to address sexual health with the nuance these topics require. Dr. Pearlman encourages men to "doctor shop" if their urologist does not have time for, or expertise in, nuanced sexual health discussions. Finding a urologist who specializes in sexual medicine - or a men's health clinic that integrates hormone optimization with sexual function - significantly improves outcomes.

Frequently Asked Questions​

Can Low Testosterone Cause Penile Shrinkage?​

Testosterone plays a foundational role in maintaining penile tissue health. Low testosterone is associated with reduced nocturnal erections, decreased libido, and higher rates of cavernosal fibrosis. Men on testosterone replacement therapy who also have poor morning erections often see significant improvement with the addition of daily tadalafil. Optimizing testosterone levels is the first step; tadalafil supports penile tissue health mechanically while testosterone supports it hormonally.

Does Penile Traction Therapy Work for Peyronie's Disease?​

Penile traction therapy (PTT) has some supporting evidence for curvature reduction and length preservation in PD, particularly when used during the active phase. The RestoreX device, developed with Mayo Clinic input, showed meaningful curvature improvement and length gains in a randomized controlled trial when used 30-90 minutes daily. However, not all devices are equal, and the evidence base for PTT is still maturing. The FDA-approved injectable collagenase clostridium histolyticum (Xiaflex/Qwo) remains the best-supported non-surgical treatment for PD with curvature between 30 and 90 degrees.

Are Nocturnal Erections More Important Than Daytime Erections for Penile Health?​

Both matter, but nocturnal penile tumescence (NPT) is arguably more critical from a maintenance standpoint because it happens repeatedly throughout every sleep cycle. A man may go days between daytime erections, but adequate NPT means 3-5 erection cycles per night throughout his life - or should. NPT quality is actually one of the earliest indicators of declining penile vascular health and is something clinicians can monitor objectively. Daily tadalafil at bedtime has a strong rationale specifically because of its support for NPT quality.

Is Daily Masturbation Too Much for Penile Tissue?​

Daily masturbation is not harmful for healthy penile tissue in most men. The concern sometimes raised - that frequent masturbation desensitizes penile tissue - is largely unsupported in the literature. More relevant is the behavioral pattern: if masturbation always occurs in exactly the same way, for exactly the same duration, the nervous system can develop a narrow arousal template. Varying conditions and approaches maintains sexual flexibility. If daily masturbation is causing discomfort, skin irritation, or interfering with partnered sexual interest, reducing frequency is practical - but this is a symptom-based decision, not a rule.

Can Peyronie's Disease Cause Erectile Dysfunction?​

Yes. Peyronie's disease and erectile dysfunction frequently co-occur. Plaque formation and curvature alter the mechanical dynamics of erection, and the psychological distress caused by PD often compounds functional ED. Studies suggest 20-60% of men with PD also have veno-occlusive dysfunction, where blood leaks out of the erection chambers too quickly. This is one reason evaluation by a sexual medicine urologist - rather than a general urologist - is important when PD is suspected.

Related ExcelMale Forum Discussions​

1. Penile Stretching as a Treatment for Peyronie's Disease: A Review - Forum thread covering published research on penile traction therapy (PTT) and vacuum erection devices for PD, including community members' first-hand experiences with traction devices.

2. Outcomes of RestoreX (PTT) in Men With Peyronie's Disease - Discussion of the randomized controlled trial data on the RestoreX traction device, including 6-month and 9-month follow-up results on curvature correction and length preservation.

3. Off-Label Use of Xiaflex for Peyronie's Disease - Review of collagenase clostridium histolyticum (Xiaflex) injections for PD, molecular mechanisms, and community discussion of real-world outcomes with intralesional therapy.

4. Is Maintaining Morning Erections Important? - Community discussion on the importance of nocturnal penile tumescence for penile oxygenation and long-term tissue health, including members' experience with TRT and tadalafil for restoring morning erections.

5. Morning Wood on Exogenous TRT - Extensive member discussion on why TRT alone does not always restore morning erections, and how the addition of daily tadalafil dramatically improves nocturnal erection quality and frequency.

6. Daily Tadalafil as a Treatment for ED and Premature Ejaculation - Clinical study discussion showing that 5 mg daily tadalafil was effective and well-tolerated for both ED and premature ejaculation over a 2-year follow-up period.

7. After Over a Year on TRT, Still No Morning Wood - Is This Normal? - Members share protocols for restoring morning erections on TRT, including low-dose Cialis, citrulline, and hCG combinations, with discussion of oxygenation as the primary driver of penile health.

8. Tadalafil (Cialis) Minimum Effective Dose - Community-driven discussion on finding the lowest effective tadalafil dose for daily use, covering dosing range (2.5 mg to 10 mg), blood pressure effects, and the practical experience of members at different ages.

Key References​

1. Rider JR et al. "Ejaculation Frequency and Risk of Prostate Cancer: Updated Results with an Additional Decade of Follow-up." European Urology, 2016. https://pubmed.ncbi.nlm.nih.gov/27033442/
2. Brock G et al. "Effect of Tadalafil Once Daily on Penile Length Loss and Morning Erections in Patients After Bilateral Nerve-sparing Radical Prostatectomy." Urology, 2015. https://www.goldjournal.net/article/S0090-4295(15)00098-9/abstract
3. Douroumis K et al. "Acute Phase Peyronie's Disease: Where Do We Stand?" Cureus, 2024. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11403542/
4. Kozub M et al. "Current trends in non-surgical management of Peyronie's disease - A narrative review." Andrology, 2024. https://onlinelibrary.wiley.com/doi/10.1111/andr.13512
5. Howell CM et al. "Current insights and future directions in Peyronie's disease management: A narrative review." UroPrecision, 2024. https://onlinelibrary.wiley.com/doi/10.1002/uro2.104
6. Reddy AG et al. "Peyronie's Disease: An Outcomes-Based Guide to Non-Surgical and Novel Treatment Modalities." Research and Reports in Urology, 2023. https://pubmed.ncbi.nlm.nih.gov/36756281/
7. Feyisetan O. "Peyronie's Disease: A Brief Overview." Cureus, 2023. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10153789/
8. Kadioglu A et al. "Tadalafil therapy for erectile dysfunction following prostatectomy." Therapeutic Advances in Urology, 2015. https://journals.sagepub.com/doi/10.1177/1756287215576626
9. Rider JR et al. "Ejaculation Frequency and Risk of Prostate Cancer." Harvard School of Public Health summary, 2016. https://www.bu.edu/sph/news/articles/2016/ejaculation-may-lower-prostate-cancer-risk/
10. StatPearls. "Peyronie Disease." NCBI Bookshelf, Updated 2024. https://www.ncbi.nlm.nih.gov/books/NBK560628/

Conclusion: What Men on TRT and Hormone Therapy Should Take Away​

The penis is subject to the same aging forces as the rest of the body - but unlike most organs, it offers clear, actionable maintenance strategies. Regular erections (whether from sex, masturbation, or nightly tadalafil) prevent the fibrosis and tissue loss that cause shrinkage over time. Understanding the difference between benign curvature and Peyronie's disease helps men know when to monitor and when to seek treatment. And the Harvard data on ejaculation frequency offers a genuine and practical reason for men to prioritize their sexual health without guilt or ambiguity.
For men on TRT, these points intersect directly with hormone management. Testosterone supports the neurological and hormonal substrate of sexual function, but it does not fully protect penile tissue health on its own - especially when nocturnal erections are absent or reduced. Daily low-dose tadalafil fills that gap, and the evidence for its penile preservation role continues to strengthen.
If you have questions about penile health, morning erections, Peyronie's disease, or tadalafil dosing, the ExcelMale community has thousands of posts on all of these topics from men navigating the same questions.


Medical Disclaimer
This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting or modifying any hormone therapy, medication, or medical treatment.

About ExcelMale.com
ExcelMale.com is the largest independent men's health forum on the internet, with over 24,000 members and more than 20 years of peer discussion covering testosterone replacement therapy, hormone optimization, peptides, sexual health, and related topics. Founded by Nelson Vergel - chemical engineer, 34-year TRT patient, and author of
Testosterone: A Man's Guide and Beyond Testosterone - ExcelMale combines clinical evidence with the lived experience of thousands of men navigating these decisions.

Joining us in The Lab is Dr. Amy Perlman, a board-certified urologist specializing in hormone optimization, sexual health, and gender-affirming care. This conversation breaks down some of the most common questions people have about male sexual health, from what’s actually “normal” to when it’s time to seek medical support.

Dr. Perlman brings a refreshingly honest, sex-positive perspective to topics often clouded by misinformation, including testosterone, erectile function, masturbation, orgasm quality, and prostate pleasure. She also highlights the gaps in sex education and medical training, and why expanding conversations around pleasure is essential for better outcomes.




KEY TAKEAWAYS:

• Many concerns about penis shape, performance, and function are normal, but knowing when to seek care is essential
• Sexual health is deeply connected to hormones, lifestyle, and overall well-being—not just performance
• Men’s pleasure, especially prostate pleasure, is under-researched and under-discussed in healthcare

SHOW SUMMARY:

01:31 – Normal vs. problematic penile curvature (Peyronie's disease context).
04:09 – Common penis-related anxieties (STI fears vs. ingrown hairs).
05:51 – The role of testosterone in sexual health and energy
.07:17 – Other factors affecting vitality (sleep, stress, thyroid).
08:37 – Misconceptions about penile tissue and the risk of penile fracture.
10:11 – Penile shrinkage and the importance of regular erections for health.
11:13 – Masturbation frequency and its link to prostate health.
12:28 – Debunking the "no-fap" trend.
14:23 – The importance of collaboration between urologists and sex therapists.
17:34 – Advice on building a "pit crew" of medical specialists before problems arise.
20:13 – Sex toys for men and the "epiphany" regarding prostate pleasure.
24:25 – Factors determining orgasm quality and intensity.
27:51 – Distinguishing between erection, orgasm, and ejaculation.
28:31 – Ejaculate volume and its impact on orgasm quality.
29:12 – Delayed ejaculation and training the body for sexual flexibility.
31:52 – Rapid-fire questions: Egos, fantasies, and erectile dysfunction.
33:20 – How to prepare for a urology visit and find the right doctor.

 

[Nelson Vergel]

Thread 'Hard Flaccid Syndrome's Effect on Erections and Sexual Function'

Jan 22, 2024

Today, we are delighted to have Dr. Josh Schammel back with us. Dr. Schammel is a third-year urology resident at Albany Medical College, and he brings valuable insights into the mysterious realm of Hard Flaccid Syndrome (HFS). In this episode, we'll delve into the impacts of HFS on erections and sexual function.

Hard Flaccid Syndrome (HFS) is marked by a semi-rigid penis in the flaccid state, loss of erectile rigidity, penile sensory changes, and psychological distress. It predominantly affects men in their second or third decade of...

• madman
• hard flaccid; ed; penis; sexual function
• Replies: 4
• Forum: When TRT Is Not Enough (ED, Libido, & More)

•