barriers

• condoms are worn over the penis during intercourse to prevent the sperm entering the vagina
• there are female condoms that are worn inside the vagina
• condoms are the only form of contraception that will protect against sexually transmitted diseases
• a diaphragm is a shallow plastic cup that fits over the cervix to form a barrier
• the diaphragm has to be used with spermicide
• spermicide is a substance that disables or kills the sperm
• spermicide can be used alone as a form of contraception, but it is not as effective (only 70-80%)