Well, to be fair, looking at games it's a reasonable expectation that romance = boinking blue alien/busty witch/etc. Romance 'belonging' - I assume you mean it must be present by this - I'm not too agreeable with. More like fluff, to me, ignoring the weirdness that some people get into regarding it. It's not really a sign that the medium is maturing, good stories to the games and well crafted worlds is probably a better sign for this genre at least (games 'maturing' is pretty nebulous and one of those things you find in high minded articles, I think).
As for movies, err, not really sure that's the case, and it's different as movies aren't interactive as games are.