Uh, I'm a girl, so let me explain. I don't get that, but, like, girls made up this because, like, if something grosses out a girl, like, okay, I'll give you an example, so a guy getting out of the pool and his butt crack shows. Some girls do not like that, like, it's unattractive, like, not attractive, but, like, it just makes them feel grossed out, so they stop liking them to a point.