16+ on my box.
You can have one gay relationship, maybe this?

The brothel in Nulb and all children in Hommlet has been taken out, only accessable with the unofficial patch <img src="/ubbthreads/images/graemlins/think.gif" alt="" /> (I haven't installed it, so I don't know why the children could be something bad. IMO they have nothing to do with the brothel.But if you choose the evil path, you can kill them, this is the reason why they were taken out)
Violence can't be it, IIRC ambivalence in your culture is more in direction of sex than of blood. Can't think of anything else.
Maybe the slaughtering of all innocents if you choose the evil path? <img src="/ubbthreads/images/graemlins/think.gif" alt="" />
Kiya
I'm out of clues. Wouldn't have noticed it if you hadn't told. Just read the chat log at the Atari forum, they speak ot "T" rating and due to intervention of Hasbro the brothel/kids were taken out - so I don't know why it's still 16+

Is 16+ a Teen rating? I just looked at ebay and it says this:
Publisher: INFOGRAMES
ESRB: Teen

I have to ask this because age rating in Germany is different, we just have the age, no letters. (And German Amazon speaks of 12+ yrs due to German youth protection laws, so this language version will probably have that then)