Mahayana Not XX and not XY
one in 1,666 births 

Klinefelter (XXY)
one in 1,000 births

Androgen insensitivity syndrome
one in 13,000 births

Partial androgen insensitivity syndrome one in 130,000 births

Classical congenital adrenal hyperplasia one in 13,000 births

Late onset adrenal hyperplasia one in 66 individuals

Vaginal agenesis one in 6,000 births

Ovotestes one in 83,000 births

Idiopathic (no discernable medical cause)one in 110,000 births

Iatrogenic (caused by medical treatment, for instance progestin administered to pregnant mother)
no estimate

5 alpha reductase deficiency
no estimate

Mixed gonadal dysgenesisno estimateComplete gonadal dysgenesis one in 150,000 births

Hypospadias (urethral opening in perineum or along penile shaft )one in 2,000 births

Hypospadias (urethral opening between corona and tip of glans penis )one in 770 births 

Total number of people whose bodies differ from standard male or female one in 100 births

Total number of people receiving surgery to "normalize" genital appearance one or two in 1,000 births
dr. ever dumbening: BS in Anthropology I learned about most of the above conditions in my very first biological anthropology class. _Sex Evolution and Behavior_ was the text. Bob Bailey and Nadine Peacock were the professors. Seeing the grey between each of those conditions had a profound impact on my view of sex and gender. It became more and more evident that rather than the distinct bimodal curve to which society so tightly clings, there is much more of a steady continuum between "male" and "female," so too between heterosexual and homosexual. I'm actually surprised that the default setting for most people isn't closer to bisexuality.

These genetic "defects" and their genesis and expression also make more apparent the contribution of both heredity _and_ environment.

If more people, including strictly fundamentalist Christians, were to look at sexual development there would likely be considerably less confusion about and hatred towards people who have different sexual practices and gender identities from the societal norm.
dries&hardens It's amazing- the things we choose to ignore. 060707
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