
That wasn't a very nice thing for him to do!!
In the future if you're worried about it you can use baby wipes to make sure you are all clean, or bathe/shower together before sex. But also, the skin around the anus is often discolored, and he could've been mistaking that for the poo....
I always use baby wipes when I might be having sex. Just makes me feel better about myself and comfortable for him to be down there.
either way it was mean of him. I'm sure he's not always 100% spotless down there either.