Several reviewers of Cyan complained about the amount of sex in the novel. I don’t understand that. It was absolutely necessary to the story, since Cyan was a description of how the exploration of nearby extra-solar planets might actually happen. Given the isolation the explorers would endure, sex was a essential part of the mix. Even then, most of the sex takes place off stage or nearly off stage.
This subject came up in a panel at Westercon. I was in the audience, not on stage. The question they were considering was, “When your characters have sex, do you shut the door?” Some did; some didn’t. No one asked me, but unless there is an overriding reason otherwise, I usually shut the door.
Even fictional people deserve some privacy.