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How might anal sex cause fecal incontinence? The authors point out that the internal anal sphincter muscle is responsible for maintaining the resting pressure of the anus (i. , keeping the anus closed, and keeping stool inside where it belongs), and previous studies show that men who receive anal intercourse have lower anal resting pressure. That muscle is designed to tighten to retain feces until released, so the sphincter could potentially weaken, he says. If youre a fan of butt play, you dont have to give it up for fear of. An anal sphincter is a group of muscles at the end of the rectum that surrounds the anus and controls the release of stool, thereby maintaining continence. There are two sphincter muscles one is internal and one is external. The internal anal sphincter is an involuntary muscle, which means you cannot consciously control it. Similar to your beating heart and your diaphragm, this muscle does its job every second of the day without you having to think about its function. The internal sphincter is programmed to stay shut, which is why most adults do not leak stool while they sleep. Anal sex is a bit of a taboo subject, despite the fact that its an increasingly popular sexual activity. As more couples explore this type of sex, understanding the risks, rewards, and proper. In the image, we see only the muscles of the vulva, which sit protected below layers of hair, skin and fat. Grays anatomy of the human body) one way to understand the mysterious bulbocavernosus sphincter muscle is to think about another sphincter, which we all know well the anal sphincter.