It is sometimes claimed that using a laptop on or in proximity of testicles can result in a lower sperm count. This Health.com article claims:
Can a laptop computer really affect a man’s ability to reproduce? According to researchers at the State University of New York at Stony Brook, there is a direct correlation between laptop use and increased scrotum temperature—up to 35˚ in certain positions!
This increase has a well-documented harmful effect on spermatogenesis (the process of male gamete formation), so if you’re trying to conceive, leave the laptop on the desk.
What evidence is there to support or contradict this claim?