wearing long dresses or short dresses doesn't necessarily define the girl's behavior. if a girl wears short dress that reveals part of her body that would put any man in temptation not to see her in a sexual way. that means there is a big chance some men would see her in a sexual way. as a boyfriend i don't think he would want other men to see his girlfriend with lustful eyes. so that is why men like long dresses. apart from that personality and behavior is way more important.