Seashells new avatar no longer makes me want to punch her in the stomach. Now I just want to do horrendous things to her huge ass.
As for why I scratch my ass - I scratch everything. I pick my nose, my ears, my eyes, my ass, the area where my nuts and my legs ferociously rub together... and then I smell my hand/fingers afterwards.
I've never met a woman that didn't think it was disgusting. All the more reason to do it.
I think of it as a way of being aware of how I'm doing - it also helps build up my exposure to germs.
I also like to smell my own farts. But never on a first date.