I'd ask myth busters to tackle this, but I think the show is too PG to deal with busting this nut of a question...pun completely intended.

Not if you use your laptop to view porn.Actually- your testes are pretty sensitive to heat. So- anything that prevents them from cooling, such as sitting in a hot tub, will temporarily reduce the number of active sperm.

I heard that the heat is what the fuss is about. Until someone proves it in a study, I would advise against doing it!!!

Any increase in heat will decrease sperm production and viability, which is why your testies are in your scrotum and are external and held away from the body. That is also why men go from tighties to boxers if they are looking to have kids.

The reason why your balls are hanging out is to cool them down.There is a disease called cryptorchidism, that causes testicle to stay in your body when you are born. If one or both testicles do not descend, a man may be infertile later in life cause sperm cannot develop properly at the bodies temperature. If you work 24/7 with your laptop on your lap, I wouldn't be surprised about a sperm count loss.

The reason why you would have a decrease in sperm count is because the heat that is generated from the laptop will denature the sperm. Sperm is protein and heat denatures the protein conformation. The conformation of proteins is what makes them unique from one another and viable to do it's job. In this case, you are destroying your army and are causing them be useless, so to speak =(.