By the way, yes, my sisters and I have rare eyebrows, hairs are far from each other, and my brother has THICK eyebrows, gorgeous, maybe This is due to the fact that we (girls) can dye our eyebrows, but men cannot :))
In addition to the fact that women are less hairy :), girls take more care of their eyebrows (so it is not even noticeable sometimes), pluck, shape, etc.
I, for example, have enough thick eyebrows. And I know many girls with quite thick eyebrows, as well as men with thin eyebrows. The thickness of the eyebrows depends more on heredity.
Because women, in principle, have a lower "hairiness" than men due to hormonal characteristics. Testosterone actively influences muscle and hair growth. Women also have facial hair, particularly on the cheeks and temples, but it is very light and fine. The same applies to thin hair on the abdomen, arms and almost their complete absence on the chest.