I don't even know what a law of human nature means tbh
It's an adaptive feature of human evolution. We are a pair bonding species, and our children take a long time to raise. This means 2 parents was really a big plus in raising human children, especially during our hunter gatherer years (see: 95+% of our time on this planet) when they had to actually go out and hunt **** to live, something pregnant women and women with young kids straggling along don't excel at.
So the division of labor was an obvious evolutionary advantage. It's not like a rule that anyone is going to enforce. It's just a better way to do things, so the selective pressures push things in that general direction.
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