DirkDiggler: Perhaps its because its the only part of themselves that they feel happy about.
I have to say that i don't have a detatchable penis and if you want to get to know it you need to get to know me first.
Its got a lot to do with the expectations that if someone has a big dick then they forfill all your hopes and desires,unfortunalty they are just as likely to be a total arsehole as anyone else,just an arsehole with a big dick.