Note that the data comes entirely from self-report (two surveys of a few hundred women each). Other studies suggest that people's perceptions of how much household labor they do aren't very accurate, so the causality could be: relationship problems -> less sex, more resentment -> more bias in the perception of labor division.
Also, a different study [0], which used self-reported data too, found the opposite conclusion. To be honest, I'm not sure how to reconcile the difference. I look forward to other people's comments on the papers' methodologies.
Note that the data comes entirely from self-report (two surveys of a few hundred women each). Other studies suggest that people's perceptions of how much household labor they do aren't very accurate, so the causality could be: relationship problems -> less sex, more resentment -> more bias in the perception of labor division.
Also, a different study [0], which used self-reported data too, found the opposite conclusion. To be honest, I'm not sure how to reconcile the difference. I look forward to other people's comments on the papers' methodologies.
[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4273893/