Having anal sex is like having large hard stools, only in reverse. It also lasts longer than a bowel movement, and may eventually result in greater carnage: enlarged internal hemorrhoids, anal fissures, ulcers, fistulas, nerve damage, rectocele, the weakness of anal sphincters, chronic pain, fecal incontinence, and, of course, chronic constipation. Anal sex causes constipation for the exact same reasons that large stools cause it — the diameter of even a small erect penis is as large or larger than the maximum aperture of the anal canal. And if the penis is large and long, it also damages the rectum, which is quite small…. In turn, these factors cause pain during defecation and result in an incomplete emptying of the bowels.
Why does anal sex cause constipation?
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If you don't think every second song is about anal sex then you're not paying close enough attention. Basically every hook in pop music ever can be construed to mean anal sex. It doesn't mean that they are actually about anal sex, it just means that we, as a society, are very, very immature.
The anal canal is a short tube surrounded by muscle at the end of your rectum. The rectum is the bottom section of your colon large intestine. When you have a bowel movement, stool leaves your body from the rectum through the anal canal. As the cancer grows, it may stay in nearby tissues or spread to other parts of the body, a process called metastasis. Anal cancer starts in the cells around or just inside the anal opening.