under Penal Code chapter 244 section 375:
a rape is said to have happen
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A man is said to commit rape who, except in the case hereinafter
excepted, has sexual intercourse with a woman under circumstances
falling under any of the 5 following descriptions:
(a) against her will;
(b) without her consent;
(c) with her consent, when her consent has been obtained by putting
her in fear of death or hurt;
(d) with her consent, when the man knows that he is not her
husband, and her consent is given because she believes that he is
another man to whom she is or believes herself to be lawfully
married or to whom she would consent;
(e) with or without her consent, when she is under 14 years of
age.
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and the punishment is :
376. (1) Subject to subsection (2), whoever commits rape shall be
punished with imprisonment for a term which may extend to 20 years,
and shall also be liable to fine or to caning.
2) Whoever, in order to commit or to facilitate the commission of
an offence of rape against any woman
(a) voluntarily causes hurt to her or to any other person; or
(b) puts her in fear of death or hurt to herself or any other
person,
and whoever commits rape by having sexual intercourse with a woman
under 14 years of age without her consent, shall be punished with
imprisonment for a term of not less than 8 years and not more than
20 years and shall also be punished with caning with not less than
12 strokes.
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althought this applys both sides but basically the law aim at the
male population in singapore. 
