Yeah there's one that I've wondered for a while now. Awhile back, I found out that women don't have prostates but they can still feel pleasure from that hole. How can they feel pleasure from that hole if they don't have a prostate?
Not female, but my guess would be that since women have what is effectively the same as the head of a penis hidden inside, and the walls of the rectum are pretty thin, it'll be getting knocked about a bit care if its close proximity. Some may enjoy this.