Too much time on the couch watching television could damage a man’s sperm production.

Researchers studied nearly 200 healthy men aged 18 to 22.

They recorded the men’s TV watching habits, along with how often they exercised and how intensely they worked out, then collected semen samples from each man.

Men who did moderate to vigorous exercise 15 hours or more per week had a significantly higher sperm concentration than those who worked out less than five hours a week.

And men who watched more than 20 hours of TV a week had almost half the sperm concentration as men who watched no TV.