Sexual Selective Memory
We have all had wholly forgettable hookups. Some are regrettable, some are embarrassing, and some we are too drunk to fully remember. But one undeniable fact about all of them is that they happened. Girls, for some reason, do not believe this and seem to engage in this odd phenomenon I call Sexual Selective Memory. Alice seems to think this is a common disorder, and even goes so far as to defend it. But I'm still calling bullshit.
I assume it starts out honestly enough. A girl goes into a bedroom with a random guy at a party, her girlfriend sees her, asks her about it he next day, and girl #1 responds "Oh, nothing happened. I passed out." And, of course, by "passed out" she means "had really drunken mediocre sex for about 15 minutes and probably didn't use a condom." But, a funny thing happens when we lie: Once we do it enough, we start to believe it. And so, just as Johnny Frat Boy has been talking about his hour-long marathon session with this girl, so is she beginning to believe she never slept with him. And since she never told anyone she did, there is nobody who can remind her of this regrettable event. Except the guy, who is most likely avoiding her like your run-of-the-mill Ebola patient.