I am 20 years old and have Klinefelter symdrome (47 XXY) and a very
small penis (<1 inch soft). Will testosterone therapy increase my
penis size?

Hi reyesss,

Thank you for your question.

Klinefelter Syndrome
http://www.genetic.org/ks/scvs/47xxy.htm

"The most common form of treatment involves administering
depotestosterone, a synthetic form of testosterone, by injection once
a month. The dose gradually needs to be increased and given more
frequently as the boys get older. Treatment should result in normal
progression of physical and sexual development, including pubic hair
growth, an increase in the size of the penis and scrotum (but not the
testes), beard growth, deepening of the voice, and increase in muscle
bulk and strength."

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More information and support groups found at this site:
http://www.klinefeltersyndrome.org/

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Best regards,
tlspiegel

Three points:

1) How large is it erect?  That's the more important size (not that
size matters as much as you might think).

2) Some people actually like small penises on their partners.

3) Other things such as a cute face, nice abs and great personality
can make up for what you perceive as a shortcoming.