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 shall not be less than two years nor more than 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.]
Source: Pakistan Penal Code (Act XLV of 1860) at pakistani.org