Rita, Sue and Bob Too(1987)

Rita and Sue are two teenagers living on a run-down council estate in Bradford, who both share a job babysitting for Bob and Michelle's children. Whilst giving them a lift home one night, Bob decides to take Rita and Sue up to a deserted, country-side landscape. Clearly knowing what he has in mind, Rita and Sue are only too happy to oblige and both have a sexual encounter with him that becomes a regular occurrence.