(c) All Nations shall enact and enforce legislation deeming unlawful and duly punishing all sexual acts involving or committed against non-consenting or invalidly consenting individuals, without prejudice to any immunities applicable to minors or persons otherwise incompetent for the purposes of criminal responsibility.
I'm surprised no one else noticed this. It seems there is already something on the books taking care of bestiality. If this is broadly interpreted then we realise that it could easily cover that topic. After all, isn't the whole point of Parthenon's proposal to target those who cannot consent?
The same resolution also defines consent.
(b) Consenting: giving full agreement by words or behavior with respect to all aspects of the sexual act or acts one is engaging in, while not being in circumstances that significantly impair judgement and seriously affect volition, including but not limited to any forms of coercion, deception, error on the identity of the partner; nor suffering from a severe mental illness.
Now, if you will all excuse this delegation, we have other proposals to go examine for profitability.