I think it plays into largely disputed ideas about ancient Sparta and Samurai culture.

Hard as nails war like cultures where same sex relationships aren't frowned upon and are even encouraged have been a staple of myth for centuries and have a degree of basis in real life, I can't see a problem with it.

It's interesting that Star Trek and Star Wars only make room for this sort of thing in their EU when a family show like Doctor Who decorates it's main show with all manner of diversity almost to the point of self parody.

It's the 21st Century, people shouldn't be shocked or even distracted by these things anymore.