http://www.legislation.gov.uk/ukpga/2003/42/section/79/notesSex offencesSexual abuseChildren at riskRapeExplanatory Notes to Sexual Offences Act 2003Home OfficeKing's Printer of Acts of Parliament2020-04-20 42 20 November 2003 148 Section 79 gives a number of definitions relevant to offences in this Part. Subsection (2) is needed so that where, for example, a person consents at the time of entry to penetration, but then withdraws his consent and the penetration continues, the person penetrating may be guilty of rape or assault by penetration.