§ 2. Crimes
Section 6
2. Anyone who, in the case of an armed conflict not of an international character, commits one of the following acts:
(a) rape, sexual slavery, enforced prostitution, enforced sterilisation or any other form of sexual violence which can be deemed to be of any gravity comparable to a grave breach of the Geneva Conventions;
shall be liable to life imprisonment or a term of imprisonment not exceeding thirty years or a sixth category fine.

Article 8
War crimes
2. For the purpose of this Statute, "war crimes" means:
(e) Other serious violations of the laws and customs applicable in armed conflicts not of
an international character, within the established framework of international law, namely, any of
the following acts:
(vi) Committing rape, sexual slavery, enforced prostitution, forced pregnancy, as defined in article 7, paragraph 2 (f), enforced sterilization, and any other form of sexual violence also constituting a serious violation of article 3 common to the four Geneva Conventions

This provision follows the ICC Statute.