That's how I met my fiance. His add was funny and that is why I hit reply (which is part of an ongoing inside joke between us).
Women tend to not be so overt about being pigs. Hell yes, we women will check a guy out that has nice pecs or a nice rear, but most women know how to do it without being obvious. My fiance is terribly obvious when checking out a chic (can't blame him for looking when the woman is letting her wares out to be seen by the world), but even he admits that I am a hell of a lot more discreet about checking a guy out. That is, unless I want him to know I am looking (read: he pissed me off so I am trying to piss him off, it occasionally works too!).