I think I know what borgboy was picking up on.
For starters, very often the inclusion of GLBT characters in a particular work is itself a sign that the writer isn't heterosexual. It takes--or at least has taken--extra effort to portray characters of non-normative sexuality, via editirs/censors and the like, hence extra justification. Very often the justification for introducing story elements which could be controversial is the writer's own desire to see a sexual orientation traditionally neglected represented in prose.
But that's just my point -- you don't have to belong to a group to desire to see it represented more. You just have to have a positive attitude toward that which is different.
I read a while back about a study suggesting that some people's brains are wired to react more positively to novelty and difference, while others are wired to react to it with more wariness and discomfort. So some people are predisposed to favor their own group, and so they assume that others think that way too, and that if someone is promoting the rights or inclusion of group X, then either they must belong to group X, or they feel reluctantly compelled to include them in service of "political correctness." What they're missing is that there are a lot of people whose affinities aren't limited to that which is similar to themselves -- people who relish and embrace diversity, people who like meeting and interacting with people who are different from themselves.
Star Trek is a series that was created by and for the latter category of people. It's about actively seeking out the new and different, embracing and understanding people who are unlike yourself. So naturally it tends to attract authors who think the same way. I don't think, therefore, that it makes sense to expect Trek novelists to be interested only in promoting the groups they themselves belong to.
I mean, look at Keith DeCandido, Dave Mack, and myself -- three white males born within a year or two of each other. Yet in the course of writing our respective post-Nemesis TNG novels, working independently, we populated the Enterprise command crew with Miranda Kadohata, Jasminder Choudhury, Dina Elfiki, T'Ryssa Chen, and Joanna Faur. Almost all the new core characters we three white men introduced were women, almost all of those nonwhite. (Although I'm not sure if Faur has ever been given a specific visual description, so she may not be Caucasian either.)
Another element of your writing that might also hint that you weren't heterosexual is your positive portrayal of characters that are sexually active and not portrayed as necessarily doing anything wrong because of that.
I'm sorry, I don't see how that follows. Plenty of heterosexuals are sexually active; the notion that there's some specific correlation between being gay and being promiscuous is just a stereotype, an attempt by people who perceive both homosexuality and promiscuity as immoral to lump them together.
T'Ryssa Chen's pursuit of multiple male sexual partners did stand out to me as a relatively prominent element of her character, as did the lack of disapproval of her sexual activity.
That's very, very strange to me. Why would you expect anyone to disapprove of someone being sexually active? This is the 21st century and we're writing about the 24th. The Victorian Era is back the other way. And did you ever see anyone disapprove of Kirk or Riker being sexually promiscuous? Frankly I'm hearing a double standard here.
That sort of sex-positive writing is something that, again, is at least reputationally more common among non-heterosexual writers.
Says who???? I've never heard anything like that before.
Here's why this is so laughable to me. Do you know why I portray T'Ryssa and other female characters in my work as sexually active? Because I like to imagine hot women getting naked and having sex. If I were gay, don't you think I'd be focusing on promiscuous male characters instead?
tl;dr? It's nice that GLBT rights have become mainstream enough that portraying non-heterosexuals in neutral or positive fashions is no longer a sure way of quietly signalling that you're non-heterosexual yourself.
Then why even bring it up?