I've spent 6-figures and almost two decades testing nearly every legitimate supplement, pharmaceutical, and peptide that was purported to have nootropic, cosmetic, or longevity promoting properties. I first tried melanotan 2 about 3 years ago and can say, without reservation, it really works. Even though I'd done a fair amount of research and was aware of the data to support claims of efficacy, until I tried it myself, it just seemed too good to be true.
So, melanotan can turn the skin of a pale person (who, after sun exposure, has never enjoyed anything better than a deep dark pink ) into a legitimate looking tan, and if you can actually tan in the sun, melanotan 2 can turn you into something closer to a Bain de Soleil model.
And yes, it is a pro-sexual.
Downside, for me, is freckles. I'm fairly fair, so at a moderate dose, I'll get a lot of new freckles, and the ones I had will get really dark. Upon cessation, the freckle situation returns pretty much to normal.
As an FYI, I don't sell, and am in no way involved with the sale or marketing of melanotan I/II (or any consumer health product for that matter). Let me know if you have any questions.