Yes, it does seem suspiciously like teasing, and GRRM in turn seems to be teasing us.
I don't think I can call what GRRM needs to write about. He does specialize in disturbing. I'm sure he would do it well.
He already did put in the Loras/Renly romance, but it isn't spelled out completely. That is already brave for many fantasy books. The gay warrior relationship is pretty common in history though. (Richard the Lionheart/Alexander the Great/Achilles/and ummm can't remember Hadrian?)Maybe he will put in some details for M/M--seems tame to me. Why not?
Yes, I think he is trying to establish that Cersei is dominant and is not content with a woman's role in society. And even though she liked to trade clothes with Jaime, and resents male status and perks, she is not satisfied by a lesbian relationship, (and wants Jaime) and that those things don't necessarily go together.
I think he is trying to show that Dany has not lost her mojo, yet doesn't want a woman or servant in an established romantic relationship, and can't pair her with another male(or female) yet.
Yes, I think he wants to show that Jon likes women, and does learn some skills (which I imagine that he will put to use later on, either that or he will heroically deny himself). Likewise, I think he wants to show that Sam likes women, even though his father maltreated him for insufficiently macho behavior.
I imagine that GRRM knows that sex sells, hotness is fun, and the different variations are part of life. He also does like breaking taboos, being a gadfly and pushing the boundaries of the genre.
