Memory Birth ControlVersion en ligne Match the type to the definition. par Ashley Kreider The hormones in the implant prevent pregnancy by interrupting ovulation. The vas deferens is cut in order to block the flow of sperm. Abstinence is the only 100% effective method for preventing pregnancy and STIs. This hormonal form of birth control is inserted in the uterus. It makes the uterus unable to sustain life Condom A coil is inserted into the fallopian tube to prevent the eggs from traveling to the uterus. The vaginal ring (inserted once a month) releases hormones that It helps to keep eggs in the ovaries. This hormonal birth control is taking by the mouth and helps to control ovulation. Pill Vasectomy During tubal ligation, the tubes are cut, tied or blocked to permanently prevent pregnancy. A covering that is placed on the penis/or vagina that prevents sperm from traveling.