On the other hand I see a couple of neon facepaint wearing space lesbians making out with fruit bowls, hair clips and dog collars in the Holofeed and that does absolutely nothing to break my suspension of disbelief or to damage my immersion in the setting. On the contrary eve is (was) as seedy, adult, beautiful tacky world of weird and wonderful sexuality and blade runner visuals with human life as cheap as the morals, ethics and general disposition of its population. Star Wars cantina scene with more dildos, spiked collars and poppers basically.
That's how I always imagined Gallente Federation, where they put hedonism to extreme
I don't think that the future should be bound with open sexuality. For example, take into consideration a Roman Empire and what happened lately with coming of Christianity and dark ages.
With this idea I consider Amarrians more like puritans. Of course, there is sexuality, and children are born somehow, but they never allow it to public. And even if you have to be a lesbian in Amarr Empire (oh sinners sinners) you would never ever talk about it. It would be a character's "dark secret", that no one should ever know.
For Caldari society, as society of hard workers and corporatism, I would find the most suitable analogy in Soviet Union. Despite there were no religion there, there also were absolutely no public sexual content. And the main source for this was society itself. It was a habit to discuss people's misbehavior publicly, and if it happened to be of sexual origin, that was quite shameful for a person, and would have some not pleasant consequences. In the State power of society is very strong too. Depending on your corporation and standards of living of your neighbors, you could easily be fired or cast away if any of your perversion or adultery will come to public eye.
But before making "tonns" of characters with little "dark secrets", take into consideration, that in societies with limited sexuality, majority of peoples are not properly educated in this matter and have very little experience. Sexuality could simple "not exist" for them, and they could consider "Star Wars cantina scenes with dildos etc" as rather dirty decadence than something "stimulating"
This would be more like disgusting and confusing for a character.
More educated ones could say: "Why two women make a family together, this way they couldn't make any childs!"