Nudity isn't truly the issue here. I have no problem with nudity. The issue is the writers, directors, and producers deciding that, "Wouldn't it be lurid if we set up decon as a way to show some skin to improve ratings?" To me that's an abuse of the actors.
Is it an abuse to show a shower scene after a difficult inner struggle over some issue, but not actually show anything? No. We are very vulnerable when alone and in the shower, we might actually show our face because of the solitude. That doesn't have to mean T and A.
Is it an abuse to show people in bed together being both playful, sexual, and tender? No, it's a normal human aspect of intimacy, and there's a wide range of vulnerability and emotion besides sexuality that happens within that context.
Is it an abuse to show sexual situations outside of the bedroom? Probably not. As couples especially, who developed a bond and true closeness, people sneek off and kiss, fondle, caress and some nudity might happen in unexpected places because couples find the time to make those happen or they happen spontaneously.
What is an abuse is to set up situations to show skin under a medical situation to allow the viewer to oogle the actors with implied sensuality. Then use those scenes to replay within dream sequences to give the writers an out, but not actually let the actors explore a healthy normal sexuality.
There's a difference between porn and relationships leading to love. Porn is gratiuitous, cares about physical attributes, not feelings. It's largely selfish and about self-pleasure and is disinterested in the Other.
None of which is really about being a fan of Star Trek, but about "give me more". To me being a fan is about having an appreciation for the actors and crew. It's not demanding to sate my appetite. I'm a fan because of a sincere appreciation for what they do, not demanding they do more.
The slippery slope of always demanding more gratuitous situations is terrible because it reduces the actors to playthings, dolls for adults, to satisy us by sexual situations, and actually ends up disempowering the actors.
When you demand a high level of gratuitous nudity, then you set up a physical standard for the actors, for the implication is every actor is going to be utilized at some point to appear nude, and so must have a high level of physical perfection.
So instead of a Star Trek that reflects societal norms in terms of the range of human appearance, the actors will all be prime physical specimens. I don't know about you, but I'd rather they have high acting ability than large breasts and big packages.
One can have both, but why would we expect that it's fair game to demand things which in any other profession would be sexist and lewd and ultimately illegal and discriminatory?
And who in history has paid that price over and over? Women mostly as a result of existing power structures of patriarchy. That's even still largely true with a very small portion of women directors in Hollywood, and a miniscule amount of women controlling corporations. Your way disempowers the actor and reempowers the very ones who abused their power historically.
The conversation is immensely distasteful, for nudity shown in a healthy relationship, to convey vulnerability, and is sensitive about using that method, all can empower an actor. That's why I find the attitude so selfish to raise an expectation to do it any time simply for a thrill. It's shallow, ungrateful, and puerile.
Re: The Other
As an older viewer who lived through the tumultous sixties and beyond, in which love became less defined by society, and more by the individual, I'm more patient about what I expect to see on television. The crew doesn't have to fix society, but usually if thoughtful attempts to deal with ongoing issues within society and to offer some solutions as well as the many voices within that society.
The decision to show brainwashing replicated repugnant gender reassignment counseling that was inflicted upon the homosexual community in fact. Prior to say the early seventies, being homosexual was consider a mental abberation according to the DSM and so people were actually institutionalized for that reason.
Showing that the same thing was actually going on in human society was not saying that was the answer, but the horror, and so was important to the story. It's up the viewer and hopefully the fan, especially the fan who knows folks in the gay community that that was taking place during the historic period in which the show was on.
Can Star Trek go further? Maybe, but not always, for there are always controversial limits, and if Star Trek becomes preachy and a bullypulpit then it's no longer Star Trek. We need to change ourselves, not Star Trek, and not expect for it to fix society.