A person aged 18 or over (A) commits an offence if—
he intentionally touches another person (B),
the touching is sexual, and
either—
B is under 16 and A does not reasonably believe that B is 16 or over, or
B is under 13.
A person guilty of an offence under this section, if the touching involved—
penetration of B's anus or vagina with a part of A's body or anything else,
penetration of B's mouth with A's penis,
penetration of A's anus or vagina with a part of B's body, or
penetration of A's mouth with B's penis,
is liable, on conviction on indictment, to imprisonment for a term not exceeding 14 years.
Unless subsection (2) applies, a person guilty of an offence under this section is liable—
on summary conviction, to imprisonment for a term not exceeding 6 months or to a fine not exceeding the statutory maximum or both;
on conviction on indictment, to imprisonment for a term not exceeding 14 years.