Wow dude, way to show your ignorance about cultures that absolutely have recognized trans people in their histories and then also equating trans people to "being cis gays, actually". That might not have been your intention, but woof is that how it's coming off as.
Yes, there
are some cultures where there's usage of terms to emasculate gay men, but that's not the case in the example that Yami no Tenchi used or even most cultures that have had historical acknowledgement of various gender identities. These are two separate issues that get conflated a lot but they're
not the same.
The latter tends to result in some pretty severe backlash, like "gay" going from meaning "happy" to effectively becoming a slur while the homosexual community tried to associate their lifestyle with happiness.
So that's not entirely how "gay" started being used as a slur: It was initially a slur towards sex workers (regardless of gender) because "gai" was associated with the "degeneration" of sex and carousing and general debauchery, which then eventually made its way as usage to describe homosexual men and women in a general capacity by association.
For 0.01% of the population being born with a penis or a vagina doesn't define you as a man or woman because genetic defects make you an exception. For another 0.1%-0.3% of people, with a number of underlying and possibly causal psychological conditions, their identity doesn't match their physical sex.
I hate doing this but: Sources for your statistics, please. Because this is part of what I'm studying for my undergrad and your numbers are way off from what I've learned.
For everyone else penis=man and vagina=woman is not just acceptable but preferable. Definitions are built on the norm not the exception which means that gender and sex will remain virtually interchangeable.
Going to ignore your comparison to the gravity expression because lol these aren't even remotely the same thing. So here's the thing, I'm not saying that the problem is that vagina = woman, I'm saying the problem is vagina = woman = femininity = womanhood. I'm saying the problem is that we say that having a vagina means there are
inherent psychological and emotional characteristics that define a person just because of what junk they have, which is patently false, it's socialized. I'm not arguing about the biological differences, I never said there
weren't biological differences. Sexual dimorphism is a thing, yes, I know that, no one's arguing it isn't a thing, that's not my point.
The issue I'm addressing is that we're equating genitals with gender roles, with gender presentation, and with
inherent traits, which is harmful to everyone because it's bullshit! Men aren't less emotional than women, but people still believe that to be the case because we're socialized to believe that. If boys cry, they get scolded for it, if girls get physically aggressive, they get scolded for it
much more quickly and harshly than boys do, etc, and that's done to uphold this idea that men are more physical, violent and distant while women are more demure, emotional and vulnerable. (Again, really gross simplification of the process, but going into specifics is a bit beyond the scope of this thread.)
Uncoupling the idea of genitals = gender identity isn't just for my comfort, it's beneficial to everyone because it helps dismantle toxic ideas that have tangible harmful consequences.