An Argentine study is claiming WiFi in close proximity to sperm may damage the sperm's quality. The article in yesterday's NY Daily News is not that surprising as was the conclusion of a 2004 study that use of lap tops causes an increase in temperature to the scrotum and hence sperm causing damage.
Just something to think about when working at home or accessing WiFi on a laptop PC. Better safe than sorry. Guessing using the WiFi on top of a nice metal table is preferable to using the couch.