Model husbands who carry out a fair share of child care duties are likely to be rewarded with better marital relations, research has shown.
US sociologists who studied more than 900 heterosexual married couples found that those who split child caring equally reported more satisfaction with their sex lives and relationships.
When women were mostly or wholly responsible for childcare, the quality of relationships and sex was lowest for both parties.
Researcher Daniel Carlson, from Georgia State University in the US, said: "What we find is that there's generally little to no downside to men being largely responsible for childcare.
"We conclude that being an engaged father is very important to men. If it weren't, we wouldn't see such a high level of satisfaction. It suggests that father engagement and sharing childcare with one's partner is important to both sexes."