Ward Dragon said:
Yeah. Their reproductive organs are not functional. A name they sometimes use for themselves is "orchids", because they have (internal) testes, but no uterus or ovaries. Other than that, they live their lives as women, without anybody else taking notice -- unless their gynecologist notices, or they get into sports at levels that require things like chromosome and anti-doping tests.
That's what caused Caster Semenya so much grief: she was well-adjusted as a young woman, and many elite female athletes don't menstruate because of their intense training, so neither she nor anybody else noticed until she started putting up exceptional times that made competitors wonder out loud whether she was doping.
Sometimes female athletes get sick of competitors or journalists carping that they are supposedly transgender, so they get married, bear children, and make sure the public takes notice.
Its formal name is AIS, "Androgen Insensitivity Syndrome". The cause is any of several recessive genes that produce non-functioning testosterone receptors. Without receptors, your body can produce all the testosterone it can, and none of it will do anything except give screwy results on blood tests. In the absence of functioning androgens, the estrogens produced by fatty tissue are enough to give you a seemingly normal, mostly functional, female phenotype.
Phoebe Hart's documentary Orchids does a much better and more sensitive job of describing the condition and the women who live with it than I have done.