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While the former and the latter are both prevailing stereotypes, ultimately they are both correct and incorrect. America DOES have a legacy of sexual not quite 'repression', but certainly a bit more congruent of the concept of innocence, so not necessarily because they are anti-fun police, or that Americans are prudes. One has to understand though that innocence was a very treasured concept - not even hundreds of years ago, you were considered an adult more or less at 12-14, variously. The sexual repression may look obstentatious now, but really, globally, culture is a lot more cognizant of adolescence. Back when the Puritans formed (in a wider sense, part of the Reformation, and the European Wars of Religion), it wasn't exactly unknown poor girls could and would be prostitutes at 12, and no one in society really batted an eye. While it wasn't doctrinally part of their platform, it was part of a noble wider platform that children should have time to grow up. If anything, American moral puritanism is more a result of social gospel/revivalist movements arising in the 1800s and 1900s.
While there is an element of repressiveness, one also has to remember American has the biggest porn industry in the world by far, American popular culture is always pushing against what 'can be' shown, and in some ways is the most degenerate in the scale and depth of what can be shown.
A way to understand this would be that America largely doesn't do things in half measures. There isn't really moderation. Very dualistic, so in sense, that's why it can be both true that America is the most prudish and yet also the most libertine of the Western world.
Now, how does that relate to the Trek question? First, for any issues about sex=bad, blame Roddenberry, he gave off that light in Mirror Mirror. It's not the sex that is more often in the Mirror universe, necessarily. First though, remember, for the most part we're seeing the Terran Empire, or it's Remnants - so what is culturally endemic or left behind in their former space isn't necessarily a galactic truth. What seems more evident is that there less cutting to the chase of power dynamics, and a seemingly more upfront attitude to proclaiming desire. The scale or power is no different than our world, it's just the mode of presentation is different. If you know any couple out there in our world, and are privy to their secrets, often you know they get up to some ridiculously kinky shit. Even 'average' people. It just seems it's a bit more open in general. There's less beating around the bush. Even Terran fashion tends to reflect it, with instead of the hide-and-seek of how we dress and use our imagination to fill in the blanks in our world, there the cultural expression seems to be presenting you the goods (and thus, truth) upfront, and leaving it to you from there, yet still being presentable and functional. Both men and women's clothes express power more in the MU, and an element of mystery/danger. You can see it in the sharper angles, the shorter hemlines, strategic empty space, wider useage of capes and sashes and other nicknacks, higher collars, lower necklines, tighter fabric, etc etc. My point is it's just a different mode of presentation.
Kira is so different from regular Kira is because her circumstances are completely different. Not only was her former oppressor completely different in her life (the Terran Empire), but they had different sort of occupation than the Cardassian one, and they have held onto Bajor a lot longer than the Cardassians had, and thus had influenced it's culture more, and even without that, Bajoran culture had evolved VERY differently in the Mirror Universe - a lot less spiritual oriented. So it's no surprise why she's so different. As for Jadzia vs worthless whiny bitch, that's also easy to understand. First, they show the more ambiguous position of Trills in the Empire, as well as reflect how Trill were later additions to the Federation. So while they'd been oppressed, eventually they had gotten freedom under the Empire, so of course there's a large segment of the population of Trill loyal to the old Empire, or wanting to bring SOMETHING to take it's place since they'd formed links with all their fellow species, hence Jadzia in with the rebels. Meanwhile, not only is worthless whiny bitch being a mercenary as well as not really sold on the old Empire loyalism reflective of the Trill side that remembers the sins done to them, or those who just want to find some niche for themselves in this new order. It's also a call back to how her family is sort of shady with the law even in the main timeline. It's not that the Mirror World is opposite land, it's just sort of the title of one of the MU episodes - looking through a mirror, darkly.
Also, Japanese oppressed? Pffft.
On a side note, one of my favorite moments was seeing how even in the Mirror Universe, while it's a bit tense and adversarial, Trip and T'Pol still love each other. You can't beat that folks. Love powerful enough it punches through dimensions.