Lol, I see that you still can't manage to wrap your massive very smart brain around the concept that sex & gender are different things.
... but school kids can 
No, you're still getting them mixed up. Boy/Man isn't a sex, it's a gender. Male is a sex. So it would be Incorrect to teach that Males can have periods, but it is correct to teach that some boys/men can have periods because not all boys/men have penises.
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