Anal sex

My boyfriend and I have vaginal and anal sex regularly. I’ve heard about anal issues like your body cannot hold its bowel movements because of so much anal and it just comes out since you can’t control it.

Has anyone ever experienced those issues with anal sex?

Also, after like 10 minutes of anal sex it goes from feeling good to I can’t wait to be over because I lose my mood or something? Does that happen to anyone? So far I think it’s happened twice