Bf born without thyroid.. does it effect men sexually? lower testosterone

Shouldn't . . .: Thyroid controls metabolism but not sexual development or maturation. Pituitary controls both thyroid & testes but if he's only missing thyroid, then testes should be ok. However, if testosterone is low, need to figure out why. Low t might be due to testicular issue (coincident w/thyroid) or be due to pituitary problem (see above) or perhaps liver (via excess iron - hemochromatosis), etc. Go c doc.