A person (A) commits an offence if—
he intentionally penetrates the vagina or anus of another person (B) with a part of his body or anything else,
the penetration is sexual,
B does not consent to the penetration, and
A does not reasonably believe that B consents.
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.
Sections 75 and 76 apply to an offence under this section.
A person guilty of an offence under this section is liable, on conviction on indictment, to imprisonment for life.