Pick up the slack and get more in the sack. Couples who split child-care chores have higher-quality relationships and better sex, a new study shows.

Men and women reported worse sex lives in relationships where women bore the brunt of child-care duties, a Georgia State University study found.

In relationships where men did most or all the childcare, women reported having the highest quality sex lives — but men reported the lowest quality of any of the couples studied.

Egalitarian arrangements had the highest overall satisfaction for the quality and amount of sex.

The grad-student findings will be presented at the American Sociological Association’s annual conference in Chicago.