Must be left in place 6-8 hours after sex. Made of chemicals that kill sperm. Easy to use, easy to carry. If a woman gets pregnant, IUD must be taken out. Should not be used by women with multiple partners.
Woman learns to recognize fertile days of menstrual cycle.
If used without birth control, is approved by all religious groups. Very low cost. Can improve a couple's communication and cooperation. Helpful when ready to become pregnant. If periods aren't regular, may not be as effective.