Great position for anal. I've done this many times with my GF. I get her to reach back and spread her butt cheeks, and then I fuck the shit out of her. She always wants me to cum in her butthole. Lots of dirty talk, it's so hot.
It's pretty obvious that the guy shot his laod in the wife's ass because her legs curl up as he penetrates deep and empties his prostate in her. She has such a lovely body that it seems a shame that she enjoys being ass fucked instead of vaginal intercourse Perhaps a combination of vaginal and anal penetration would placate her sexual deaire, but i do concur with her decision to be creampied in the ass if she is fertile and not using the pill to avoid a pregnancy.