Fucking,.,.,. Who said that males have a 90 degree mandible? What terf saw that and went “yes we can totally determine the angle of a person’s jaw bone by looking at them while they are alive and have skin and muscles on them still” cause holy fucking shit!! That’s the dumbest thing that I have ever heard!!
Also I doubt you even know what part of the mandible is 90 degrees! If y’all did then you would know that you can’t determine that by looking at a living person and that you could only see it if you were looking at bones! The part that is 90 degrees in males is the Gonial Angle, which is the the angle formed by the corpus and ascending ramus!
It’s the dumbest fucking thing to assume that all sexual dimorphism in humans is linked to our bone structure, cause if you knew how our bones are shaped, you would know it has actually pretty subtle differences except in the case of the pelvis! We aren’t like most other hominoids! Males do not have crests on their skulls or are 2-3x the size of females! This is what a male vs female skull looks like
Note that the differences aren’t actually as much as terfs seem to think! Not to mention that this doesn’t account for racial differences in skulls as well.
These are both female skulls! Note that when you compare the skull of a female European to a female african, the European skull looks much more like a male skull.
The only real sexual dimorphism in humans that we can say for certain is caused by genetics and evolution is our size. A lot of what causes sexual diamorphism in humans is hormonal! That’s why hormones can drastically change the appearance of a person. Plus, there’s social aspects that can also affect our sexual dimorphism, like workload or how society sees body types of specific genders.
But looking back at the skulls, let’s compare it to other hominoids! Heres the skulls of gorillas:
Notice how there’s FAR more sexual dimorphism in gorillas compared to that of humans. It’s much more definite and clear as to what gender is which skull. Compared to other great apes, humans have very low sexual dimorphism.
So tl;dr: stop claiming bone structure is how you can determine the gender of a human while the human is still alive because most of human sexual dimorphism is hormonal and “males have 90 degree mandibles” is not something you should be using to determine the gender of a living human