Despite the well-developed breasts in CAIS women, and for reasons that are not well-understood, breast cancer has never been reported in CAIS women and does not seem to occur or occurs only rarely. The risk of malignant germ cell tumors in women with CAIS increases with age and has been estimated to be 3.6% at 25 years and 33% at 50 years. However, recent studies show that bone mineral density is similar whether gonadectomy occurs before or after puberty, and is decreased despite estrogen supplementation, leading some to hypothesize that the deficiency is directly attributable to the role of androgens in bone mineralization. Some have hypothesized that the decreased bone mineral density observed in women with CAIS is related to the timing of gonadectomy and inadequate estrogen supplementation. The production rates of testosterone, estradiol, and estrone have been reported to be higher in gonadally intact with CAIS than in men. Hormone levels have been reported in gonadally intact people with CAIS in a number of studies.
The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb. The second theory is similar and known as "evolutionary neuroandrogenic (ENA) theory of male aggression". have been undertaken on the relationship between more general aggressive behavior, and feelings, and testosterone. On the other hand, elevated testosterone in men may increase their generosity, primarily to attract a potential mate. Higher testosterone levels in men reduce the risk of becoming or staying unemployed. If a father's testosterone levels decrease in response to hearing their baby cry, it is an indication of empathizing with the baby. For instance, fluctuation in testosterone levels when a child is in distress has been found to be indicative of fathering styles.|In women, correlations may exist between positive orgasm experience and testosterone levels. 2020 guidelines from the American College of Physicians support the discussion of testosterone treatment in adult men with age-related low levels of testosterone who have sexual dysfunction. This is known as hormone replacement therapy (HRT) or testosterone replacement therapy (TRT), which maintains serum testosterone levels in the normal range. For women with PCOS, hormones like birth control pills can be used to help lessen the effects of this increased level of testosterone.|The brain is also affected by this sexual differentiation; the enzyme aromatase converts testosterone into estradiol that is responsible for masculinization of the brain in male mice. Adult testosterone effects are more clearly demonstrable in males than in females, but are likely important to both sexes. The male brain is masculinized by the aromatization of testosterone into estradiol, which crosses the blood–brain barrier and enters the male brain, whereas female fetuses have α-fetoprotein, which binds the estrogen so that female brains are not affected. In humans and most other vertebrates, testosterone is secreted primarily by the testicles of males and, to a lesser extent, the ovaries of females.|In non-human primates, it may be that testosterone in puberty stimulates sexual arousal, which allows the primate to increasingly seek out sexual experiences with females and thus creates a sexual preference for females. When testosterone-deprived rats were given medium levels of testosterone, their sexual behaviours (copulation, partner preference, etc.) resumed, but not when given low amounts of the same hormone. Studies have shown small or inconsistent correlations between testosterone levels and male orgasm experience, as well as sexual assertiveness in both sexes. In males, these are usual late pubertal effects, and occur in women after prolonged periods of heightened levels of free testosterone in the blood.|The hormonal pathways seem to be highly attuned to stimulating facial hair follicles. The historical image of the stoic Russian or the formidable Cossack often includes a full, commanding beard. Countries like Russia, Poland, Ukraine, Belarus, and the Balkan nations are frequently cited for their men’s impressive facial hair. It’s not uncommon to see men in their early twenties already sporting beards that others might take years to cultivate. From my personal observations, whether it’s attending a craft fair in a small town in rural England or watching a documentary about Scandinavian history, the prevalence of naturally full and well-formed beards is striking. The prevailing theory suggests that populations in these colder climates may have evolved thicker facial hair as a means of insulation.|Some individuals with CAIS or PAIS do not have any AR mutations despite clinical, hormonal, and histological features sufficient to warrant an AIS diagnosis; up to 5% of women with CAIS do not have an AR mutation, as well as between 27 and 72% of individuals with PAIS. Inheritance is typically maternal and follows an X-linked recessive pattern; individuals with a 46,XY karyotype always express the mutant gene since they have only one X chromosome, whereas 46,XX carriers are minimally affected. Androgen insensitivity syndrome is the largest single entity that leads to 46,XY undermasculinized genitalia.|Men who produce more testosterone are more likely to engage in extramarital sex. Men who produce less testosterone are more likely to be in a relationship or married, and men who produce more testosterone are more likely to divorce. However, the testosterone changes observed do not seem to be maintained as relationships develop over time.}
So far, gonadectomy is performed at early age, in order to avoid the risk of malignancies and the psychosocial difficulties in submitting an adolescent female to gonadectomy (24). In postpuberal patients estradiol levels are normal or slightly elevated for a male individual (22). These patients present with normal male external genitalia, but testosterone resistance will develop with disease progression. Differential diagnosis of CAIS includes complete gonadal dysgenesis, Mayer-Rokitanski-Kuster-Hauser syndrome and Mullerian ducts anomalies (1).
Cortisol, the body’s primary stress hormone, competes with testosterone, DHT, and other androgenic hormones at the androgen receptor. And while stress undermines many physiological systems, particularly relevant to this discussion is how stress—and specifically the stress hormone cortisol—influences androgen receptor sensitivity. Research by Prasad (2013) highlights how zinc deficiency can reduce androgen receptor sensitivity and lower testosterone’s effectiveness in the body. Resistance training—lifting weights—is one of the most reliable ways to support both androgen receptor sensitivity and androgenic hormone production.
A link has also been found between relaxation following sexual arousal and testosterone levels. The reflexive testosterone increases in male mice is related to the male's initial level of sexual arousal. Every mammalian species examined demonstrated a marked increase in a male's testosterone level upon encountering a novel female.
Examples include genital virilisation such as midline fusion, phallic urethra, scrotal thinning and rugation, and phallic enlargement; although the role of testosterone is far smaller than that of dihydrotestosterone. Effects before birth are divided into two categories, classified in relation to the stages of development. Testosterone can either directly exert effects on target tissues or be metabolized by 5α-reductase into dihydrotestosterone (DHT) or aromatized to estradiol (E2). Testosterone can be described as having anabolic and androgenic (virilising) effects, though these categorical descriptions are somewhat arbitrary, as there is a great deal of mutual overlap between them.
If the testes fail to secrete testosterone, or the androgen receptors do not function properly, the Wolffian ducts degenerate. Not every mutation of the AR gene results in androgen insensitivity; one particular mutation occurs in 8 to 14% of genetic males, and is thought to adversely affect only a small number of individuals when other genetic factors are present. The insensitivity to androgens is therefore clinically significant only when it occurs in genetic males, (i.e. individuals with a Y-chromosome, or more specifically, an SRY gene). During puberty, children who are genetically male with 5-alpha reductase deficiency experience a lack of facial hair growth.
Clinical findings indicative of AIS include the presence of a short vagina or undermasculinized genitalia, partial or complete regression of Müllerian structures, bilateral nondysplastic testes, and impaired spermatogenesis and/or virilization. The pathogenesis of spinal and bulbar muscular atrophy (SBMA) demonstrates that even the mutant AR protein itself can result in pathology. The form of breast cancer seen in some men with PAIS is caused by a mutation in the AR's DNA-binding domain. This predictive ability is primarily retrospective in origin; the different functional domains of the AR gene have been elucidated by analyzing the effects of specific mutations in different regions of the AR.

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