Basically any drug that would stimulates your melanocortins (not many OTC as they are Rx for sexual dysfunction) and or
(although Cocaine, MDMA and Cannabis and Ritalin are not exactly OTC)
you’d want something more like:
(the ancients got that one right on thinking Saffron would be aphrodisiac, for it was) but you need very high doses of it, curiously enough (but that’s my speculation, so don’t take my word) has a slight similar long chain and structure, that might have somewhat of an effect.
Phenethylamines are a notorious class of a...