Their collar bones. Do you have any idea how sexy it is when a girl wears the right kind of shirt where her collar bones are showing? I sometimes have to catch my breath when I notice them. I just want to run my hands across them while we are laying in bed. She can go on for hours as I sit silently and run my finger back and forth across them. A woman’s body is beautiful and collar bones are one of many things that are unbelievably attractive.