I feel that something productive should come from this post, after I've gotten in my snipe on the matter and offer a hand to Strolen for his spellcraft skill.
I think it brings up the idea that in a realistic fantasy setting, one that draws on our RL world without bogging down into soap operas and techno-magic. People are always looking for *ahem* love.
I would break this down into three main avenues of interest.
1. Genuine love, looking for that special someone. This would be the realm of divination magics, or joint conjuration, possibly even ressurection of lost loves. The modern analog being the match site, or dating company.
2. Genuine Lust, or the booty call. sometimes a prostitute isnt quite right, or inconvenient. Or perhaps it is a way to create a summon prostitute spell, or a spell-like item to convey a would be john to the brothel, outside of illegal grounds. Potions that foster love would fall into this area, as would most charisma enhancing items.
3. Better Endowments - bigger is better, for the ladies and for the fellows. The list of false potions, oils, and magical devices should be a scoll in it's own. Spam is full of this sort of offer.
I'm going to copy and paste most of this submission into a scroll/codex.