I hardly remember viewing Porn in the 80's/90's and seeing an anal creampies. Even when you check the talent agencies there are a handful of females that perform creampies and fewer that will do anal creampies.
Then there's Aurora Jolie (Nicara) that only does anal no vag.
She just finished a new flick in which she does an anal creampie in every scene.
Cum in my Booty ....Sorry about the B Pumper music.
I would think that anal creampies would be the greater risk.