Homo Sapiens, despite all its culture, it is still commanded by Nature to do everything it can to spread its genes. A (nice) side-effect of that is that we are lewd. The problem is that we loose our composure when we drink.

Just playing the devil's advocate here, but let's assume for a minute we could reorganize things a little to avoid matters like this becoming a problem.

Like say, we could make women stronger than men, or we could give people a switch to turn their libido off, or we could invent a drug that when people intoxicate with it they want to speak about math instead of having sex. Any ideas?