I think you may be generalizing. Thats like what girls are saying, "all guys are interested in is sex . . no guy would EVER truly want to get to know a girl AND enjoy her on a non sexual level - he would only act that way just to have sex with her." . . . . we should all be man enough to admit that this is DEFINATELY not true.
maybe if she's fat or ugly...
otherwise the thought of plowing her all night long is always there in the back of your head...