An offence under section 66 F3, 66A, 66B(2) or (3)F2, 67 or 67A of that Act (exposure F4, sending etc photograph or film of genitals, sharing intimate photograph or film with intent to cause alarm, distress or humiliation or for purpose of obtaining sexual gratification and voyeurism) where the victim or intended victim of the offence was under 18 at the time of the offence.