As long as the asshole is clean, there's no real problem. Its just skin.
I freely confess to having a female (clean) asshole fetish and and oral fixation.
It does annoy my wife occasionally, but once in a great while it makes her day. It's a rare combination of me being brave enough to try for it and her being in a kinky enough mood to like it.
Yeah. I'll take it a little further right after (or in) a shower myself.
