'If you hope to spawn a brood of kids someday, do yourself a favour: Keep that laptop off your lap. An Argentinian study published in Fertility and Sterility found that electromagnetic frequencies – such as those from Wi-fi – can kill sperm. For the experiment, the scientists separated sperm samples into two pots. One was placed close to a laptop with the Wi-fi function activated and left there for four hours. The other had the same environmental conditions but with no laptop present.
You can read more at hhttp://www.menshealth.com.sg/health/can-wi-fi-kill-your-sperm