(Speaking of real life-before I met Matt) If a guy did that, he got automatically ignored by me. I'm not some kind of piece of meat and I don't like to be looked like that. Also it says a lot about the person and I wouldn't want to be with someone like that. Even more annoying when they can't contain themselves and make "animal" like comments or sounds or whistle. Also, I noticed most of the time it was old pervs who probably already have a wife. Poor woman.
But I know some girls like that kind of attention. My friend was like that before.