YES!
I sometimes masturbate while receiving anal sex.
Or, have my parther; or a thrid person; stroke my cock and fondle my balls while I am being fucked in the ass.
Sometimes, while in the doggie position, just my cock and balls dangling down; swing back and forth, makes me cum without being touched.
And yes, when I cum, my asshole tightens up; making the experience even more thrilling.