Most people assumed all the slick "gay rights" references in nuWho (most of which were "blink and you're miss it" aside jokes that would go over kid's heads) were because the producer of the 2005 Doctor Who revival, was openly gay leftist Russell T. Davies, and his best known prior work was helming "Queer as Folk".
But the bizarre thing is that nuWho seemed to be even MORE in your face with the "gay rights" propaganda AFTER Davies left the show and the (straight) Steven Moffat assumed control of the franchise. Now they have whole episodes revolving around "happily married" gay couples.
Why Moffant wants to promote the gay agenda so aggressively is beyond me. There are entire episodes I refuse to rewatch because they insisted on having some blatant "gay couple" subplot. The worst was perhaps the episode "Closing Time", an otherwise completely solid and enjoyable story about the Doctor and an overwhelmed new dad having to track down a baby in a department store overrun by Cybermen. For some bizarre reason, they just HAD to include a "humorous" subplot about Doctor #11 and the new dad being mistaken for gay lovers. Without all the "aren't they a lovely couple?" remarks, the episode WOULD have been great.
You never saw Sherlock?. "Mistaken for poof" is a Moffant thing.