It would be awesome if I was wrong, because this is all I get off on at this point. The fun factor — Many adults will have enjoyed playing with water as a child, and engaged in games that involve soaking one another. Also, although many would no doubt consider it disgusting, cleaning a partner when they have finished urinating by licking their genitals is a very intimate, loving, affectionate, caring act. When women do have anal sex, the overwhelming majority, do so at the request of their male partner. In some Polynesian cultures, anal sex was practiced explicitly as a means of birth control. This will NOT happen during the actual act. Many women are nervous, insecure, and have issues accepting anal sex, due to the physical requirements and reputation it seems to have. The anus has an enormous amount of nerve endings, both surrounding it and directly within it. Many men find anal sex more pleasurable than vaginal sex because the anus is tighter than the vagina. Anal sex, and a desire for anal sex, serves different purposes for men. Because men like naughty, horny women. A woman engaging in anal sex shows her desire and willingness to have sex in a purely physical way, with no thought of pregnancy. At this point, I would send my boyfriend to squirting lessons so he can do this for me. Men are sexually interested by variety, but aside from this, there is no relevant evolutionary argument, as anal sex of course produces no heirs. He also says he wants me to have affairs and would like to watch or at least have me describe the experience to him during our lovemaking. Not like, 70s, 80s, but a rusted, weathered looking father is so attractive to me. Heterosexual anal sex has been around for millennia.