The link was to the guilt factor. I can go back and add a link for the PTO. Google it and you find doznes of articles. Here's one: https://www.entrepreneur.com/growing-a-business/heres-why-women-take-less-vacation-time-than-men-and/319871

One thing you need to keep in mind is that women often bear the brunt of taking SICK TIME to care for a kid because it is far more common for women to do this than men. However, that is not rest time.

Regarding the child rearing, women do far more work than men in raising the kids. This happens when they get home from work and on the weekends. Men have far more leisure time than women.