QUOTE : You see..." Nash said, acting doctorly, "you've got to keep the testicles away from the body's heat for optimal sperm count." He snatched two chicken balls from the container in front of him and cupped them in his hand. He laid a spring roll between them. "That's the biggest source of the sperm count issue for many men: their choice of underwear keeps their testicles snug up against the body. The testes become overheated.