prostitution
The 'illegal' act of paying for sex, although it's 'legally' committed many times in dating. Guy pays for dinner, pays for the movie, girl is flattered by guy's "generosity," so she gives him some ass at the end of the night, which is exactly what he was hoping to get in return for the money he shelled out and why he took her out to begin with. Why it's illegal to just give the girl the money straight up to fuck him that he would've spent on the date anyway is beyond me.
Example:
"I don't understand why prostitution is illegal. Why should prostitution be illegal? Selling is legal, fucking is legal. Why isn't selling fucking legal? After all, giving somebody an orgasm is hardly the worst thing you can do to them!" - George Carlin
"I don't understand why prostitution is illegal. Why should prostitution be illegal? Selling is legal, fucking is legal. Why isn't selling fucking legal? After all, giving somebody an orgasm is hardly the worst thing you can do to them!" - George Carlin