Just need to monitor your diet (fruits, vegetables, whole grains, less meat and empty carbs) and your bowel movements to know when is or isn't a good night for anal play.
Truthfully?
I find some light touching and tickling to be very stimulating. We have some latex gloves and plenty of lube around so that's all good.
So when she takes my dick in her mouth then stimulates me down there. Phew! Hot stuff.
Penetration? I keep mindful of my bowel movements and I always shower and clean if I'm down for some that night. A finger is sufficient, but we got really crazy one night on Bourbon street and bought two vibrators. One was a g-spot vibrator, the other was a normal one.
Except it was 8 inches and 2 1/2 - 3 inches thick...Like I said, we were horny that night and I clearly wasn't thinking with my head. Holy crap. That thing was huge. I think I took probably 6 inches of that before she hit something painful. Not pleasurable at all. I'll stick to her digits in the mean time.