>>81847110
Go ahead, the circumstantial evidence adds up, but you'll never get an actual comprehensive study on this.
>the alloimmunologic response of the female body trying to destroy male fetal cells can be mapped to physical states in the brain
>repeated physical states in the brain do act as evolutionary pressure
>after a long enough evolutionary timeline the mammalian brain recognizes the male pregnancy as a disease and the male a product of it

You can actually observe the phenomenon indirectly:
>Studies show higher maternal immune activation in male vs. female pregnancies, with elevated cytokines linked to H-Y antigens. This is implicated in conditions like recurrent miscarriage, where anti-H-Y antibodies are more prevalent.
>Cytokines can cross the blood-brain barrier or send signals through nerves. They "talk" to brain areas like the amygdala, making you feel anxious, irritable, or even repelled by something or someone perceived as a threat.

This applies to ALL MAMMALS and all species that have the male carrying the "foreign" chromosome, if the male of the species isn't even blessed with variability or definitive maleness traits which helps them to protect themselves(i.e. the females are significantly stronger/bigger/more numerous) they are immediately killed after their genetic material is extracted(bees, praying mantises, spiders).

I believe male sexual dimorphic traits emerged not just because of environmental pressure, but to protect themselves from the female organism which, simply put, recognize them as a virus.

The telltale sign is the reversed system in birds, where the female carries the foreign material (ZW/ZZ), there's absolutely no hostility or avoidance by the males because their immune system never interacted with the "foreign" material, so they can pair bond effortlessly.
>15% of avian species pair bond for life vs 3% of mammals
>all avian species are strictly monogamous during a nesting season, while mammals mostly just "hit and run"