Blatantly injurious erotic anorectal violence—involving a combination of rapid thrusting, a girthy penis/object, and a prolonged duration—is rampant worldwide, facilitated by widespread (willful) ignorance, apathy, and misinformation. It is impossible for resultant anal and rectal injuries and serious/chronic/permanent health consequences to be uncommon due to anorectal fragility relating to anatomy and neuromuscular physiology [References: Anorectal Risks 1-3]. When more than one person is involved such abuse should therefore constitute severely criminal behavior for any penetrative person—especially if significant mental pathology, a strong judgment-impairing drug, etc. are involved.
Pornography featuring anorectal violence can have numerous effects on some viewers. It may serve as inspiration for their own activities, condition them to be aroused by suffering, and contribute to development of related mental pathology: sexual sadism disorder, sexual masochism disorder, and perhaps even psychopathy for younger individuals [References: Trends & Associations]. People with such inclinations, some affiliated with pornography companies, are having a field day with anorectal violence and spreading disinformation. That unrestrained hedonism is promoting societal decadence.
Governments worldwide have not addressed those matters effectively, and many people are suffering as a result. First and foremost, educational systems under their purview are failing to adequately and accurately educate people about anorectal anatomy, physiology, health, and especially the traumatic risks of anoreceptive activities. Secondly, governments are failing to rein in out-of-control pornography industries over which they have jurisdiction. Lastly, for people who both 1) harm others for profit and 2) inspire countless viewers, governments are failing to ensure that they face severe criminal consequences: Some of those viewers are inspired to the point of emulation, even using coercion.(shit thread)
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Traumatic risks of human anoreceptive activities include inflammation, abrasion and tearing, muscle and connective tissue damage, and colorectal perforation. Sequelae may arise, such as hemorrhage/hematoma, hemorrhoidal disease, ulceration, bacterial infection followed by abscess / fistula / life-threatening systemic sepsis, rectal prolapse, fecal incontinence, anal skin tag (remnant of external hemorrhoidal thrombosis, scar tissue from a healed tear, or a sentinel tag for a chronic anal fissure), and anatomic stenosis (narrowing due to constricting scar tissue). One instance of trauma can lead to multiple complications. Cumulative damage and preexisting conditions are concerns as well.
~2cm beyond the anal opening at the pectinate/dentate line, the epithelium transitions from stratified squamous (anoderm) to a simple columnar mucosal lining in part of the narrow surgical anal canal, continuing along the rectum. That lining is very fragile and easily damaged especially if its mucus barrier is removed by an enema or otherwise impaired. Furthermore, some enemas and lubricants can inflame the lining and even cause it to slough off entirely. Injury to that lining alone elicits no pain sensations due to a lack of somatic innervation, so resultant problems may remain undetected absent one or more obvious symptoms.
Neuromuscular physiology also contributes to anorectal fragility particularly for girthy and vigorous insertions, which are objectively foolish and very likely to be significantly injurious. The involuntary internal anal sphincter relaxes with rectal distension. The puborectalis and external sphincter completely relax when a person bears down, causing hemorrhoidal cushions to engorge and become more susceptible to injury by shear (frictional sliding) force.
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Several English-language Wikipedia articles have had major, inexcusable flaws for many years. Among other issues:
• The article about the human anus has an image of a human female's anus and perineum that probably were damaged by some kind of major trauma. Human females beyond developmental stages in the womb should lack an externally-visible perineal raphe, or seamlike union/ridge, in the anogenital region between the anus and the vagina; the bulbospongiosus muscle is separated in them and does not form a persistent, visible midline raphe as it may in males [References: Anatomy & Trauma]. Furthermore, the article about the perineal raphe claims otherwise with no support from any cited source.
• The article about simple columnar epithelium explains nothing about its fragility nor lack of somatic innervation (for pain sensitivity).
The article about anal sex …
• lacks a neutral point of view — an essential component of Wikipedia's presentational philosophy. It fails to present even one _scientific_ opposing perspective, giving readers without exposure to more balanced sources the impression that opposition is limited to irrational religious positions. One such scientific perspective: The human anorectum is very unsuited for many all-too-common receptive activities due to the region's anatomy and physiology. The single short-term benefit, _potential_ pleasure, is greatly outweighed by the many short-term and long-term health risks for the receptive person. [Rationale: Anorectal Risks 1-3]
• fails to mention the normalization of injurious anoreceptive violence in pornography featuring real people.
• does not point out that "hemorrhoid" is an ambiguous term, sometimes referring to pathology and other times to normal anatomy.
• contains a logically-fallacious appeal to nature: "natural" is not necessarily good or desirable, nor is "unnatural" necessarily the inverse.
Those flaws contribute to rampant anorectal abuse and misinformation facilitating it.