I think everyone who is an adolescent and up has done a look in their life. Anyone who denies it is either lying, or has some sort of mental illness. Looking at it scientifically, boobs and ass are exaggerated protrusions and that one of its main purpose is to attract a suitable partner. Men are attracted to it because it shows a healthy potential partner. I've done it, but since I'm a lanky person, I don't think I've had much experience being looked/leered at.