Erection without libido. Mate, at least you've got half of it working! I better understand your situation. I'm not as knowledgeable as a few(or many) of the other guys on this forum, but maybe more T is a solution. Just a guess. As for
Trimix, never tried it but I've read men saying it's painless. 30g, 1/2 inch needle. I'd use 31 gauge.
Yesterday morning, went back to subq and was awakened by an erection! My wife and I sleep in separate bedrooms because of sleep issues but the wood was good enough for a quick slap and tickle, LOL.