And up to the first knuckle, you don't have to jam soap up there but wash your nasty ass if you expect anyone to not gag when they get near your crotch.
Seriously. If I was a girl, there's no way I'd want to fuck someone with a filthy asshole, especially on my sheets. Skidmarks on the sheets and smelling like old shit is gross.
Wash your ass and groin with soap and water just like you do your armpits and feet.
My unasked for advice? Keep your butthole hair trimmed or shaved. Makes it much easier to keep clean, and it takes two seconds in the shower.