 [ Symptoms ] how can you cool down the main vein in a males testicle that gets too hot and causes infertility [ Disease ] most helpful answer hi see a uro first perhaps he will have other ideas to what treatment you need worth a try found you this piece of info any other situation that raises the temperature of a man is testis for a long period of time might affect his sperm count and cause infertility wearing tight or heavy clothing that insulates the scrotal area can raise scrotal temperature by 1 or 2 degrees fahrenheit which could lower sperm count over time although this has not been proven conclusively in research studies taking long hot baths or using a sauna might also raise testicular temperature after about 10 minutes of exposure to heat which could also lower sperm output if this happens regularly a study published in october 2012 in spermatogenesis suggests obesity and a large belly might cause increased testicular temperature and contribute to decreased sperm counts and infertility this possibility is somewhat controversial and needs confirmation in additional carefully controlled studies good luck