Types of Natural Family Planning: Fertility Awareness Methods: 3: To use this method, the woman takes her temperature each morning immediately after waking either orally or with an ear thermometer before she undertakes any activity As soon as she notices a slight dip in temp followed by an increase, she knows that she has ovulated. She refrains from having coitus for the next 3 days (the life of the discharged ovum). Because sperm can survive for at least 4 days in the female reproductive tract, it is usually recommended that the couple combine this method with a calendar method, so that they abstain for a few days before ovulation as well. Advantage(s): No Cost Disadvantage(s): Less effective due limitation the the temperature can also rise caused by illness, starting an aerobic program -Ineffective in the prevention of STDs