Barrier Methods: 4: Is a circular rubber disk that is placed over the cervix before intercourse to mechanically halt the sperm. Usually, but not required, coated with using a spermicidal gel. With the use of a spermicide, the failure rate of the diaphragm is as low as 6% (ideal) to 18% (typical use) Is prescribed and fitted initially by a health-care provider to ensure a correct fit. Refitting after pregnancy, miscarriage, cervical surgery (dilatation and curettage), gains or loses greater than 15 lb. Disadvantage(s): Prescription and initial fitting needed