2Sexual assault by penetrationS
(1)If a person (“A”), with any part of A's body or anything else—
(a)without another person (“B”) consenting, and
(b)without any reasonable belief that B consents,
penetrates sexually to any extent, either intending to do so or reckless as to whether there is penetration, the vagina or anus of B then A commits an offence, to be known as the offence of sexual assault by penetration.
(2)For the purposes of this section, penetration is a continuing act from entry to withdrawal of whatever is intruded; but this subsection is subject to subsection (3).
(3)In a case where penetration is initially consented to but at some point of time the consent is withdrawn, subsection (2) is to be construed as if the reference in it to a continuing act from entry were a reference to a continuing act from that point of time.
(4)Without prejudice to the generality of subsection (1), the reference in that subsection to penetration with any part of A's body is to be construed as including a reference to penetration with A's penis.