What is the point of showing your dick?

So my question to all of you out there, is what is the turn on for displaying your dick on your profile? To this point I have resisted the temptation except for one drunken evening when I sent one of my xhamster friends a photo by mail. Not sure it had the desired effect and whilst we are still friends, new mails have not been forthcoming. So, the question is....should I post a pick of my cock, my dick, my one eyed friend, the old fella?