Sections 377 and 377A of the Penal Code (Singapore)
From Wikipedia

The Singapore Penal Code, Chapter XVI (Offences Affecting the Human Body), Section 377 (Cap. 224) states that:

Whoever voluntarily has carnal intercourse against the order of nature with any man, woman or animals, shall be punished with imprisonment for life, or with imprisonment for a term which may extend to 10 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.

Section 377A (Outrages on decency) states that:

Any male person who, in public or private, commits, or abets the commission of, or procures or attempts to procure the commission by any male person of, any act of gross indecency with another male person, shall be punished with imprisonment for a term which may extend to 2 years.