1. This response is incorrect because exposing the testes to the heat of the sauna can alter the normal morphology of the sperm. 2. Alcohol consumed in excessive amounts can alter spermatogenesis, but one beer per day has not been shown to be a problem. 3. The high temperature of the sauna could alter the number and morphology of the sperm. 4. Chemotherapy has been shown to affect the ability of males to create sperm.