I'm guessing it's because they're sex organs and things happen to them when they get aroused. LIke if some guy touches your knee, nothing happens, but if a guy touches your boobs then...thing happen hahaha. Also they're a rare sight (minus porn magazines, and movies.) No matter how loose fit clothing or tight clothing a girl wears, her boobs are always covered. Even in bikini's. They can be as skimpy as hell but their boobs are always partially covered I think guys like them so much because for a long time they;re forbidden from their sight and touch until they can get close emotionally enough with a girl to gain trust and to sleep with her and fool around.
Its just a sexual tool when can use to subdouse a men (or woman) its the way they use them that makes men get aroused.
Its something sexual that men have in there body
Because we don't have them. We all want what we don't have.
I am very fond of them myself.
Because they don't have it