If you're planning a family and making a list of things to do in preparation, one thing you may want to add to the list is no television.
A new study by the Harvard School of Public Health shows that men who are spending more time in front of the TV may be setting themselves up for some serious fertility issues.
Men who watch TV for three hours a day have half the sperm count of men who don't watch much TV at all.
This is the first time a study shows that if men live a less-active life, their sperm quality isn't as high as men who are active.
Now before we blame the TV, there are factors at play here. The men who were watching less TV were more active. Of the men studied who were working out more than 15 hours a week, had a 73 percent higher sperm count.
So it's more than just turning off the TV -- guys need to get active.
If men are thinking, "No problem, I'll just work out more and still watch as much TV as I want" -- not so much.
The study shows that the TV watching cancels out the benefits of exercise!
Experts say the lower sperm count does not mean men won't be able to make a baby, but it does lower their chances of being successful.
Other things that cause lower sperm count include poor diet and especially if they eat too much saturated fat.
And of course, the ones men have heard before: tight underwear -- even though David Beckham and the Calvin Klein model seen during Super Bowl ads make them look so "wearable," you probably want to get some boxers.
Video: FOX 10's Kristin Anderson reports.