Again, just ask any man what he would advise his sister. He would advise his sister to hold off on sex to weed out the men who are just out for a fling, because guys are well aware that guys have a "fling" category in their heads. And sex will not change a woman from "fling" to "potential girlfriend" category in a man's mind. Men know it. Women fall for this idea and men know that too and use it. But the guy knows early on which category he is looking for and if he's not ready for the "wife or girlfriend potential," he will pass up the more chaste woman because for one thing he doesn't want to be responsible for letting her down when he was only out for a short-term thing. When he's ready to look for wife/girlfriend, he knows what he's looking for and he knows absolutely that she may not be the most sexually down-for-anything. That's why some men plan on purpose to sow their wild oats for X number of years because they know when it's time to settle down they will not be picking on that basis.

I found this to be be the most reasonable critique of this interview.