http://www.newsweek.com/same-sex-relationships-chores-housework-1854592

Same-sex couples are significantly better at dividing the labor of household tasks, research has found, and how they negotiate chore sharing can be useful to improve sharing in opposite-sex couples.

In opposite-sex couples, women do the majority of the housework and childcare. This can lead to strains in relationships, and burnout and health issues for those taking the brunt of the tasks.