Sperm concentration, total sperm count, and percentage of healthy, normal sperm were lower in men reporting 5 or more drinks per week, according to Danish researchers. Men who typically drank more than 25 drinks per week had a 33% decrease compared to men who drank 5 or less per week. It is not known if this effect is permanent.
PositiveTip: Young men be warned: Habitual alcohol use may hurt the chances of reproducing.