The cervical cap whose plastic dome adheres to the vaginal fornices is as effective a contraceptive device as the vaginal diaphragm when self-inserted. It provides continuous harmless protection throughout the menstrual cycle provided patients are properly selected and their tolerance verified. Inflammatory complications and development of cervical carcinoma have been absent in women using these caps. The accumulation of menstrual fluid has been reported causing abdominal discomfort or relapse of old adnexal infections. The best practice is to leave the device in place overnight following coitus or to remove it after coitus and douche immediately. Demand and satisfaction on the part of clientele who choose the cap over other methods indicate that it holds potential for individual acts of coitus, for protracted lengths of time in the vagina and for special indications.