Young Margaret Dempsey is an Irish Catholic girl discovering her sexual freedom in London. But she just can't shake off those nagging feelings of guilt. Then her closest friend, a failed priest, helps her set up The Compassionate Order for Relief - a quasi-religious sect that promotes sexual activity for spiritual reward.

The Mount Olive Priory is formed and becomes a secret training centre where novices shed their inhibitions and learn how to pleasure themselves and others. Going through intense initiation ceremonies and strict discipline, the novice brothers and sisters soon learn that the only sins in the Order are failing to explore your innermost desires and not sinning enough!