It is definitely a societal thing. Women in our modern society have broken free from gender roles imposed on them and have a multitude of options available to them, while men don't seem to be afforded as many choices without fear of society frowning on those choices. I don't think the inequities are mentioned much because most men don't really want those choices, but to be fair: women can wear their hair short or long with no stigma but even today men with long hair get at least razzed about it, women can wear "mens" clothes: pants, dress shirts, even ties if they want - there is no limit, but of course men are strictly forbidden to stray outside the men's section, even wearing pink is iffy. Women can pursue any career, but if a man wants to be a nurse, there is still a stigma he faces, likewise a babysitter or child care giver, he is mistrusted. The same goes on and on for jewelry, makeup, showing emotion, showing affection for friends of the same sex, etc.
As for bisexuality, I have heard many women say they don't think two men together is pleasant to even think about much less a turn on, but I have heard other women say they would find it a turn on. I think if men knew it turned women on, and other men wouldn't disapprove, they would be all for it, as that is a motivating factor for men doing all kinds of things.
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