I'm a guy who likes guys.
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How implausible would it be to enforce masculinity as the appealing aesthetic on both biological genders?
It would be exactly as successful as forcing straightness on the gay population. So, we basically already tried this concept, and can we all agree it doesn't work? You can't force people to be attracted to just anything you want. If you could, we wouldn't have sexual orientation in the first place.
Typical straight guy is physically repulsed by the idea of sleeping with a woman who looks manly. And that's just as innate as gay men not wanting sex with women.
Culture never told me what to be attracted to, I just was. Sure, there are variants in ideals of beauty, but even those fall into a number of patterns that can be fairly well predicted by the material circumstances of a civilization. i.e. the more social disruption, stress, food scarcity, danger, the larger women come to be viewed as attractive. The more stable and controlled societies, thin / younger women come to be seen as more desirable. So it's a variable, but it's not an independent variable that just exists in a vacuum, all sorts of social factors shape this without our realizing it.
Sure, there are also personal variations but there are also studies showing those are on a sliding scale with the personal rates of stress etc.
The point I was unsuccessfully trying to make was that - relative to behavior, not appearance - "manliness" is associated with things that both sexes can and have every reason to do (with a few clichéd exceptions), whereas "womanliness" is oft associated with being demure, compliant, and submissive, things that, were there not outside factors encouraging it, neither sex would want to have anything to do with. With that considered, what if we shifted manliness (and obviously started calling it something else) to become an appropriate behavioral "style" for both genders?
Ok, maybe i misconstrued your first post, but I'll leave my response there because it's still on-topic, and has relevant observations for the thread.
Well, trying to force both genders into the typical behavior of one gender is probably just as problematic as the appearance thing. Take for instance schooling. The way girls approach schooling is much different, boys have many more behavioral problems etc. The type of manipulation you're talking at has to start at a very young age, so if you're going to reeducate little girls to be little boys, expect to see more of the same sorts of behavioral issues to pop up in girls that you see in boys now.
Assuming they're maleable in this way, what does that suggest for future violence? Men commit more violence than women, training women to be just like men, well, expect a spike in violence down the track. You can expect to see gender-equality in the murder rate, prison rate etc.
To be serious "feminize everyone" is much more viable that "masculinize everyone"