I find it intriguing that, in the Sci-Fi genre, for so long nobody has really taken issue with the idea of inter-species romantic relationships, but yet when homosexuality is thrown into the mix, some people who probably wouldn't care about humans in relationships with robots or aliens really get bent out of shape.

I guess the upshot of my comment would be: If you're so worried about a child bumping into deviant views on anything, why are you exposing them to science fiction?

I'm sure there's sci-fi written to abide by current moral bounds, but I find it somewhat less "believable" than sci-fi that leaves all options open.