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Survey research program conducted by the National Center for Health Statistics
National surveys show oral sex is common across ages but tends to increase with age: most adults (>75–80%) report ever giving or receiving oral sex, while adolescents report lower but still substantia...
National surveys and research reviews show oral-sex initiation typically clusters in mid-to-late adolescence (roughly ages 15–18) with prevalence rising sharply into the early 20s and then varying acr...
Medical and sex-education reporting says repeated or forceful anal penetration can injure the anal canal and in some studies is associated with reduced resting anal pressure and fecal incontinence in ...
Large surveys and reviews find an association between receptive/penetrative anal intercourse and higher rates of fecal incontinence (FI), with stronger links when practices are frequent (≥ weekly), in...
Epidemiologic studies report an association between receptive anal intercourse and higher odds of fecal incontinence, but they do not prove that anal sex by itself causally destroys bowel control . Cl...
Available, peer‑reviewed population studies do not show a clear, large rise in men’s circulating estrogen (estradiol) across recent decades; some national analyses report stable or even declining estr...
Urinary glyphosate concentrations are consistently higher in occupationally exposed groups—especially farmers who recently applied glyphosate—than in the general population, but non‑occupational expos...
A well-established body of peer‑reviewed literature and large public datasets documents extreme human anatomical measurements across weight, stature, cranial metrics and body shape, while a growing me...
Reported rates of swallowing ejaculation among women vary widely across sources, but reliable, comparable cross‑country estimates are scarce because most rigorous sexual health surveys measure oral‑se...
Multiple population studies and narrative reviews report higher rates of fecal incontinence (FI) among people who report anal intercourse compared with those who do not: a large French survey of 21,76...
Large, repeated probability surveys like Britain’s Natsal series show that oral sex has become a common part of sexual repertoires over recent decades—especially among younger cohorts—and that rises i...
The literature indicates a consistent association between (RAI/API) and higher self-reported rates of anorectal symptoms — including (anal pain) and (FI) — across diverse study designs and populations...
There are surprisingly few true longitudinal studies that track anorectal structure and function over years of frequent receptive anal intercourse (RAI); the literature is dominated by cross‑sectional...
Clinical research shows a consistent signal: frequent receptive anal intercourse (RAI) is associated with higher prevalence of fecal incontinence (FI) and measurable changes in anorectal function in m...
A systematic read of the supplied reporting finds no true longitudinal cohort studies that directly link lifetime frequency of receptive anal intercourse (RAI) to later-life fecal incontinence (FI); t...
A small but consistent body of clinical case reports and physiological studies establishes biological plausibility that receptive anal intercourse (RAI) can injure the anal sphincter, yet population-l...
Supplemental L‑tyrosine is the biochemical precursor for the tyrosyl residues that become iodinated in thyroglobulin, but the rate‑limiting steps for circulating free T4/T3 and TSH setpoints are gover...
There are no long-term, prospective studies that specifically quantify anal incontinence rates among people who frequently use anal toys; the peer-reviewed literature instead measures associations bet...
Receptive anal intercourse is an established risk factor for anal cancer primarily because it increases exposure of the anal mucosa to oncogenic human papillomavirus (HPV), and multiple epidemiologic ...
National, probability-based surveys that ask about oral sex (e.g., NHANES and NSFG) document how common oral sex is but do not ask a standard, nationally representative question about whether women “u...