15.Section 6 makes it an offence for a person intentionally to penetrate sexually the vagina or anus of a child under the age of 13 with a part of his body, such as a finger, or with anything else, such as bottle or other object. The penetration must be sexual, as defined in section 78. Whether or not the child consented to the act is irrelevant.
Commentary on Sections Part 1: Sexual Offences Section 6: Assault of a child under 13 by penetration