The anal canal has some similarities to the vaginal canal. Anal Canal also contains incredibly sensitive internal walls because of all the concentrated nerve endings. The reason anal sex can be painful is because the walls inside the anal canal are much thinner and more vulnerable than the walls inside the vaginal canal. The entrance of the anus (anal ring), just like the entrance of the vagina, i surrounded by lots of nerve endings, which can give her variety of pleasures. Separating the butt cheeks will give her erotic sensations similar to spreading her vaginal lips. Kristine Whitmore from the Pelvic Floor Institute has been quoted as saying: “Anal stimulation can trigger the same nerve pathways as deep-vaginal orgasms.” I’ve spoken to women before who have experienced anal orgasms and they say it’s a very deep and powerful sensation.