As little as four hours of exposure to laptops with WiFi can damage sperm, according to a recent study by the American Society for Reproduction in Denver.

"This is the first scientific study showing that a laptop computer connected by WiFi may damage DNA and decrease sperm motility," Conrado Avendano, Research Director at the Nascentis Reproductive Medical Center in Argentina, stated in a news release Wednesday.

Avendano says if men are trying to have children, they should not work with a WiFi-enabled laptop near their lap, or should instead connect to the Internet using cables.

The issue, Avendano says, is the microwave radiation.

According to the group that did the study, a previous study on cell phones revealed that microwave radiation can decrease sperm quality. That led scientists to advise men to avoid carrying cell phones in their pants.