I have a special girl who tongues and rims my asshole while jerking me off all over her hubby's face and down his throat. She grooms meI shave around my anus as part of my normal shower routine. If I'm home I squat down, knees apart and razor around my open hole. It becomes quite easy with practice. If I'm at the gym showers I put a foot up on a solidly fixed corner shelf and shave in close. Either way I get the shaved head in really tight for a smooth finish. It leaves me feeling clean and sexy.