Before people get excited, search penal code 377. OP is misrepresenting it and slapping a rainbow over it.
377 is a anti-homosexuality law. Protections for men who have been raped are still needed, but are a separate issue from 377.
Here is the text of 377:
Unnatural offences: Whoever voluntarily has carnal intercourse against the order of nature with any man, woman or animal, shall be punished with imprisonment for life, or with imprisonment of either description for a term which may extend to ten years, and shall also be liable to fine. Explanation: Penetration is sufficient to constitute the carnal intercourse necessary to the offence described in this section.