Pt141 is the only true aphrodisiac that actually works on the brain as opposed to blood flow like ed meds. Its a peptide as well.
It was discovered by a university in arizona( i think) and its the portion of melanotan2 that gives the side effect of erections etc.. And no you wont tan because it doesnt act on the melanocortin like mt2 does.
Its only the aphrodisiac part.
Mens health did a writeup on it a while back. Pretty cool stuff.