Oh, America. Why the hell do we always freak out whenever sex is involved? Seriously,it's a part of life, so why can't we just accept that and move on? People have genitalia and a desire to use said organs, and the sooner we figure that out, the less time we'll spend sticking our heads in the sand. Besides, it's not like they're really saving the children or anything--even if sex WERE harmful (which it's not), a curious kid need only head for the nearest computer to find out what sex is all about.
I'm kind of going on a tangent here, but American opinions on sex and sexuality really annoy me. On the one hand, EVERYTHING is sexualized, and it's almost guaranteed that a piece of entertainment media will have a man or woman (depending on the intended audience) thrown in for eye candy. Conversely, if anything becomes obviously sexual, a storm of shit comes through shouting 'O MY GOD THINX OF THE CHYLDRENS!!!1!11!' I really, really wish that we could get past this puritanical view of sexuality and just enjoy it.
Getting back on topic, I'm not really surprised that this isn't getting an American release (for the reasons outlined above). I don't really think that it's necessarily a great loss, but it's still infuriating to see America's useless and contradictory views on sexuality muck things up.