Yes, this is no joke at all...I remember coming across an article that said, this can also lessen the sperm count in men as well. I'll try to find the article and post it.
Of course this is true, sperm needs to be a specific temp to stay viable, thats why that thing's in a sac, if it's to hot then your scrotum loosens up and it hangs, if it's too cold then it tightens up and gets close to your body. If the temps to hot, then oh wells your sperm count goes down becuase they die, so having a hot computer on your legs warming up that area, say bye bye to your sperm basicially.