So, after this careful analysis, here are my concluding thoughts on anal sex as a healthcare professional specializing in colon and rectal diseases:
Anal sex seems to significantly raise your risk of having fecal incontinence.
You probably just shouldn’t do it.
If you are going to do it anyway, don’t do it too frequently.
It seems like common sense, but use lots of lube.
When finding a partner for anal sex, smaller is probably better.