Anal sex is sex at its rawest form, and the pinnacle of sexual domination. Vaginal and oral sex allows some control over the encounter, but anal sex is the absolute in submissive intercourse. The most satisfying thing about anal sex is the recipient's intense reaction to anal penetration. The sphincter itself is tight, especially at the beginning of the act, but the rectum is smooth and not tight. The fact that semen can stay in the ass and be noticeable hours later is a turn-on. When a woman is willing to engage in anal sex, she accepts having sex in a purely physical way without thought for pregnancy. She is embracing, to some degree, a willingness to make her body a sexual object.