@LitPearl To expand a bit, although it's probably not the explanation you're expecting - I am very wary of people propounding biological theories that give women the shitty end of the stick whilst making it Christmas every day for men. My reasons for this are grounded in the history of biology.
If you go back to the mid-19th century, the sciences did not have the reputation or standing that they have now. There were very few professional men of science (I use that term, rather than 'scientist' with care). Darwin himself was an amateur and amateurs at the time were often very well respected, the meaning of that word has changed too. The biological sciences were in their infancy, there was little training in them, few positions, no real career prospects, little structure, hardly any funding. So men of science battled to increase all of these and to turn their subjects into professions.
As part of this, they argued that they could solve 'the woman question' definitively and unquestioningly. Given the lower status of women at the time, they worked to exclude women from the sciences and deliberately portrayed science as more masculine and rational, in distinction to being female and emotional. So built into biology are many ideas about women being lesser, being irrational, and as having restricted roles in society because they are women. Women were defined as reproductive and limited to a reproductive sphere whilst men were productive and could go out into the world.
Now I'm not denying differences between men and women, both psychological and physical, although I also recognise that sex difference is itself now a very controversial topic. However, biology has a history of putting women down, and men of science did this quite deliberately to enhance the standing of their profession.
21st century research biologists put far more thought into counteracting gender bias in their research. However, within the popular imagination and literature, amongst those with a less in-depth knowledge, there are persistent myths about sex difference. But what it boils down to is this - if women are being told that they should accept something lesser because of their biology, look very carefully at that biology and the person putting the ideas forward.