Apparently I don't have any, as I had sex with my boyfriend the second time we met.
I dunno...life is short. If you meet somebody and you both really want it, and neither of you is attached, then go for it. Of course, it's probably a good idea to not have any illusions that it's anything more than a roll in the hay. In my case, it did develop into a "relationship," but it could just as easily not have. And honestly, either way would've been fine with me. Actually, I think a "friends with benefits" arrangement is better for me than a "relationship" anyway.