A person (A) commits an offence if—
he intentionally engages in an activity,
the activity is sexual,
for the purpose of obtaining sexual gratification, he engages in it—
when another person (B) is present or is in a place from which A can be observed, and
knowing or believing that B is aware, or intending that B should be aware, that he is engaging in it,
B agrees to be present or in the place referred to in paragraph (c)(i) because of an inducement offered or given, a threat made or a deception practised by A for the purpose of obtaining that agreement,
B has a mental disorder, and
A knows or could reasonably be expected to know that B has a mental disorder.
A person guilty of an offence under this section is liable—
on summary conviction, to imprisonment for a term not exceeding 6 months or a fine not exceeding the statutory maximum or both;
on conviction on indictment, to imprisonment for a term not exceeding 10 years.