David Edelstein: “The movie is only OK, though. It gets hobbled out of the starting gate because Andie doesn't go to bed with Benjamin right away; and if she doesn't sleep with him and then start in at once with the "I love you" stuff, the experiment doesn't have the naughty zing you've been primed to expect. Most guys will put up with anything before sex. The filmmakers must have been afraid of losing their mainstream audience if they made their heroine deceitful and promiscuous, so they end up dynamiting their premise.”
Emphasis in original.