Anyone Else Noticing a Trend?

OK, over the past few weeks I've been noticing a trend in several shows in the terms of putting gay or lesbian couples out in the open. I have no real opinion whatsoever on the matter in reality, I'm just noticing it's becoming a lot more prominent in shows where the characters were originally presented as straight. For instance, on Bones Angela has recently become bisexual and is in a relationship with another woman, then there's Grey's Anatomy with Callie's character, even though that one is ending with one of them leaving. Let's see, then there's the relationship with Gaeta being gay on Battlestar Galactica as well as Admiral Cain being a lesbian. Are these shows trying to be politically correct or something by making sure to include gays and lesbians? Like I said, I really don't mind relationships in real life, but a lot of these shows are suddenly making this leap with characters I had assumed were straight because they would be in relationships with members of the opposite sex. For goodness sakes even Supernatural had an episode last season in that one episode where the fact that a character was gay was made a somewhat significant part of the storyline. What's the deal? Is this going to be a new trend with every television show to include all groups? Sometimes I think they try to make the leap and it just doesn't suit the story or series, and it can be kind of annoying. Anybody else have an opinion on this, or at least notice this? Anyhow, this has been my monthly, or maybe bimonthly, rant. Everyone has a great Thanksgiving. Enjoy.