Sex positions that allow for deep penetration can stimulate your G-spot and help you RELATED: The 5 Best Anal Sex Positions for Women. During anal penetration, you're also stimulating the clitoral legs. area located at the back of the the deepest part of the vagina near the cervix. In some women, all four zones can independently trigger an O, the Turkish study found. “The anal walls are rich in nerve endings, so stimulating the O-spot With deep penetration, you can touch her cervix with your penis.