A diaphragm is a silicone or TPE dome that is inserted into the vagina and hooked over the pubic bone so it sits under the cervix in order to stop sperm getting into the cervix. The diaphragm has to be fitted by a doctor to make sure to have the correct size, but the woman inserts the diaphragm along with spermicidal gel before sex and it stays in for a few hours after sex.
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