I'm sure there's more than a couple of guys reading this who've met a great girl at a party, had a few drinks, fallen into bed with her and, after nature's taken its course, thought to himself, "If she did that with me, how many other guys has she done it with?"
Men, well, a lot of us are hypocritical bastards and while we'd never consider that having sex within hours of meeting someone would make us a "manwhore", we're more than happy to apply similiar pejoratives to a woman.
It's almost like we want the female to make the decision for us, to stick the chair into the face of the growling lion of our libidos; if she fails to do this, that means there are two animals in the bedroom and there's plenty of guys uncomfortable with a woman who is as sexually available as they are.
Of course, this is all patriarchal bullshit, but I'm writing about the world as it is, rather than how it should be.
Some of the sweetest, most respectful relationships roar to life after first date sex and the almost cataclysmic nature of your attraction serves to confirm you were meant to be together; you're flattered she was so certain so soon.
But there are plenty of other instances where it goes the other way - where you wish you'd waited a little longer before bumping uglies - paid some respect to the act and each other.
In the end I always take these arguments back to what I'd tell my daughter if she asked me for advice and on this subject my response is a no-brainer.
"Never have sex on the first date. He'll still be there for date two and, believe me, he'll respect you more for making him work for it."