Diaphragm These dome shaped plastic devices act as a physical barrier to fertilization. They are available in several sizes and are inserted into the vagina to cover the cervix . They are used most effectively with a spermicide that is applied prior to insertion of the diaphragm. The use of a diaphragm is about 6 times less effective than oral contraceptives in preventing pregnancy. This flexible tube shaped barrier is placed over the erect penis so that the ejaculate is retained within the tube.
Condoms come in various, materials, colors and styles.
It should be noted that all condoms do not protect equally against STD's. Those made of animal skin allow the passage of infectious viruses , and should be avoided. The use of a condom is about 11 times less effective than oral contraceptives in preventing pregnancy. Oral Contraceptives Oral contraceptives are one of the most popular forms of contraception. They do not provide protection against STDs.