klinefelter's syndrome

Klinefelter's syndrome is a genetic disorder which means that men have an XXY chromosome set up rather than the usual XY (for a male). The XXY almost always causes feminisation of men or anti-masculinisation. Klinefelter's syndrome can be extreme or non-apparent depending on the person. Usual symptoms can be :
Enlarged breasts
Wide hips
Voice not breaking
Narrow shoulders
Long arms or legs
testicular atrophy (small testicles)
infertility

Crossdresser's would probably like to have klinefelter's syndrome so that they would look girlier.

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