Can anal sex cause constipation?

Yes: A bowel movement is a well coordinated muscular event.Retrograde (anal) penetration can have significant impact on that event. Please use barrier potection(condom) if male/female.

Possibly: If damage to the sphincter occurred, control of gas and or stool can be a problem. Best to avoid anal sex. The anus was designed as an exit, not an entrance.

No: No, it can't.

No: Constipation has nothing to do with anal sex or sex in general. Drink a lot of fluids, increase fiber in the diet and stay active physically.