Well they already have Vastra and Jenny (and had Jack) so I doubt more LGBT characters are on the horizon.
As said, we had the transsexual horse.
Jack was ok but most of it was written by RTD. That would be fine by me (my first glimpse on doctor who was in "Queer as folk"

anyway).
As for Vastra and Jenny - it is something completely different to show a male pair than a female pairing. But you're right, I don't remember any cheap jokes that annoyed me concerning them (but I find them a little boring anyway).
My point is: I think Moffat is a little awkward if it comes to relationships in general. I was just happy that Danny is dead (sorry) and there is no "relationship" for a while.