Some thoughts on gang sex (medical students are friends of humanity)

First, unprotected sex easily transmits sexually transmitted infections (STIs), and the risk is many times higher than vaginal intercourse. The biggest problem is the ease of infection, mainly because the rectum easily absorbs fluids, and the anal structure is easily damaged during intercourse. If one partner has an STI, such as HIV, amoeba, or chlamydia, it is easily transmitted through unprotected sex. Even with a condom, it can easily break or slip off during intercourse, causing danger. Unprotected sex can also transmit syphilis, genital warts, and chancroid. Unprotected sex is
particularly susceptible to human papillomavirus (HPV) infection, and studies have found a link between this virus and anal canal cancer, although sex does not directly cause cancer. Research from the Fred Hutchinson Cancer Research Center in the United States found that people who repeatedly engage in unprotected sex have a 7 times higher incidence of anal canal cancer.
Unprotected sex can cause damage to the anal structure. The vagina is composed of stratified squamous epithelium, similar to our skin, and is relatively resistant to friction. The anus, in comparison, is much more fragile, and forced penile insertion during intercourse can easily cause damage to the anal and rectal mucosa. The dentate line, where the anal canal skin meets the rectal mucosa, is located above the anal canal. The dentate line originates from the endoderm, and the mucosa is covered with a single layer of columnar epithelium, making it easily damaged by friction. This part is innervated by visceral sensory nerves, making it insensitive to pain, and injuries may go unnoticed. Below the dentate line, the dentate line originates from the ectoderm, and the canal wall is covered with stratified squamous epithelium, providing good abrasion resistance and extensibility. Its sensory nerves are the somatic sensory nerve fibers within the anal nerve, making it more sensitive to pain (hence the significant pain associated with external hemorrhoids, infections, and anal fissures
in the lower anal canal). Above and below the dentate line are transitional zones between the mucosal and dermal epithelium. Furthermore, the arterial origins, venous and lymphatic drainage above and below the dentate line differ, which is clinically significant. Sexually transmitted rectal ulcers are very common in homosexual men, with ulcer lesions often occurring on the posterior rectal wall 5-7 cm from the anus. These ulcers are relatively deep and often cause bleeding. Ulcers resulting from rectal mucosal injury are often slow to heal and can sometimes harden, easily mistaken for rectal cancer. The main treatment is to stop the bleeding. If there is a concurrent infection, antibiotic treatment is also necessary.
Bleeding can easily tear the anal sphincter, which can worsen hemorrhoid symptoms.
The anus and rectum contain feces, which contain a large number of infectious microorganisms. Even if an enema is performed before bleeding, it is often not completely clean. (Clinically, enemas aim to thoroughly remove feces retained in the colon and are commonly used for rectal and colonic X-rays and bowel preparation before surgery. First, an enema is performed with soapy water, followed by several enemas with saline solution until the excrement is clear and free of feces.)

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Some thoughts on gang sex (medical students are friends of humanity)

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