(1) A person (A) commits an offence if—
(a) he intentionally penetrates the vagina or anus of another person (B) with a part of his body or anything else,
(b) the penetration is sexual,
(c) B does not consent to the penetration, and
(d) A does not reasonably believe that B consents.
(2) Whether a belief is reasonable is to be determined having regard to all the circumstances, including any steps A has taken to ascertain whether B consents.
(3) Sections 75 and 76 apply to an offence under this section.
(4) A person guilty of an offence under this section is liable, on conviction on indictment, to imprisonment for life.