"A person commits an offence if- (a) for the purposes of sexual gratification, he observes another person doing a private act, and (b) he knows that the other person does not consent to being observed for his sexual gratification. Section 67(4) provides: (4) A person commits an offence if he installs equipment, constructs or adapts a structure or part of a structure, with the intention of enabling himself or another person to commit an offence under subsection (1)."