All the safety manuals say gallons of lube and powerwash her gut first. If she's into it, having to do an enema every time is a buzz kill. I believe she knows better. If she feels like going to the bathroom first that ok. If she needs to go in the middle, that's OK. I she is enjoying it she will have bowel movements during anal even within enema it ends up being mostly clear fluid instead of poop. If she orgasm from anal she will poop. Destigmatizing incidental anal pooping has lead to assgasms in.my experience with women.