Without reading all the posts above me, I would probably only shake my head about people who believe that the topic "love and sex" is more reprehensible than the topic "violence". But USA already proved it being reality, even innocent children with an age below 8 had been issued for sexual harrasment...
Fortunately, this is not the topic here, right?
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Love and erotic should be able to be part of the life in Yliakum, to some reasonable extent, in my personal opinion. Explicit sexuality, instead, is definitely not recommendable (you may not be able to control personal messages = "/tell", though - I just mean public chat).
Prohibiting explicit sexuality in the game rules, and explicitly limiting ages in the character registration, may be the only way to express this opinion of the developers (and especially "reliable people"), although they are circumventable. But officially rating a game (by the development team or an organisation), is something beyond my understanding regarding "safety".
Including minors in sexual topics is a crime, true. But keeping children away from any slightest hint of this topic until they are adult, and scotching any kind of objective discussion, won't help the development of a balanced personality of children either. Love and sexuality is part of a human's life. And avoiding criminal acts is a duty of everyone. Relying on written rules and put-on labels only, is not a final solution.