LadyCoco

I study animation, so we were also teached about how differents shows works. Depending the public they want to direct the show, is the way this works. Steven Universe have merch, I know. Comics, clothes and some variety of things, but this is mostly made by CN itself due the popularity of the show. It is not a show made only for sell merch. You cant compare the inmense quantity of things Hasbro release of MLP with the little amount of SU merch. Korra, for example, already do that big step with their finale! It was really awesome to see if I can say, and every year we have more games and shows that are more open, but mostly for teens sadly. Idk, I think we start to go out of topic here, sorry. Edit: I come back years later to fix my english, lol. Still broken, but better.

Yes, Steven Universe is a big step into showing more kinds of relationship in the TV, but here is the problem. MLP is mostly showed at DiscoveryFamily, who is for children aged between 6 and 11. I know it was showed at Hub before, but still was something to Hasbro. Who sell toys to kids? Hasbro. Who buy the toys to the kids? Moms and dads. Dont put them angry. Steven Universe is different. Is a CN show who is "primarily aimed at children and teenagers between the ages of 7–16" and the fun fact? Steven U dont have toy companies behind, so is a little more free.

Since Homosexuality is something natural, and Horses are some of the animals that display it Im sure there are some gay couples in Equestria. The thing is how much that is accepted in their society. I feel like Equestria is a much open world than ours, so maybe is more common that what we think, but sadly is a children show and there are some rules about what can be showed to the public.

I think everybody thinks is a girl because this toy that came up some time ago:

I like more your theory. Btw, nobody check the episodes? Blublood basically dont appear in any of the ones that the OP said.