If using testosterone therapy for a period of time the testes may appear to shrink even more and harden. This is because they effectively shut down because they have no active function. If testosterone therapy is stopped and pituitary hormones are given it has be shown that in the majority of cases the testes will start up again and can be induced into producing their own testosterone and sperm. This inducement into sperm production can take anything up to 6 to 18 months to occur.
There might be a reduction in the amount of semen produced, but most of the fluid in semen does not come from the testes. Normal ejaculation is normally possible even though in most cases no viable sperm would be produced.
If the levels of testosterone have been corrected in KS or HH there should be no effects on the ability to have erections or ejaculations.
If a person has KS or HH it is advised that a sperm test is done before assuming that no viable sperm are being produced. There are even rarer forms of HH where a very low level of sperm production is possible, even if it appears there has been no testicular development. If in doubt it might be advisable to use a form of contraception if appropriate.
(published with permission in writing from:http://www.hypohh.net)
