@BadMedicalTakes
You realize humans are a dimorphic species, yes? That it was a crucial survival skill to evolve the ability to detect the opposite sex? That's why we can always tell, because millions of years of evolution designed us to be able too.
This isn't remotely controversial
@BadMedicalTakes
All men have acromegaly, all women have hydrocephalus.
I'm pretty sure I've seen the picture before & it's an actual textbook illustration, albeit one intentionally exaggerated for effect. Reverse image search isn't much help to me since all the results are in Russian.
@BadMedicalTakes
Modern phrenology aside they can literally never tell lol. Of all eight billion people on this earth they are the absolute last ones who can clock someone as trans