text: I guess...\n\nIt is said that heat in a way sorta lowers the sperm count and cold increases it. This knowledge has been around for quite a while, as some tribe members in Africa actually use dip their testicles in hot water a few days before sexual intercourse as a form of birth control.\n\nHence, if you put a laptop on your lap - the heat from the battery might nullify the sperm count for a few days, but it won't really affect your fertility. That's my thought on the subject. I'm just passing on what I read in a book... =p