Too much “Westworld” may cause men to fire blanks.

A new study suggests men who spend too much time binge-watching TV have lower sperm counts compared to men who don’t watch the boob tube, according to researchers at the University of Copenhagen in Denmark.

The study found men who watched five or more hours of TV per day had 29 percent lower sperm concentration, and 34 percent lower sperm counts than men who weren’t binge-watching.

Lying around increases the temperature of the scrotum — which has a negative impact on sperm production, the researchers said.

Also, couch potatoes tend to be overweight or drink excessively, two more factors in lower sperm counts and production, according to the study, published in the November issue of the American Journal of Epidemiology.

Men who played on a computer for the same amount of time didn’t experience a dip in semen levels.

That’s because watching TV is more passive than playing on a computer, since one tends to remain more still while watching television, the researchers noted.

The researchers suggested limiting couch time and increasing physical activity to ensure maximum semen production.