Also known as natural family planning or periodic abstinence, fertility awareness entails not having sexual intercourse or using a barrier method of birth control on the days of a woman's menstrual cycle when she is more likely to become pregnant.
Because a sperm may live in the female's reproductive tract for up to seven days and the egg may remain fertile for about 24 hours, a woman could get pregnant from intercourse that occurred from seven dkays before ovulation to 24 hours or more after. Methods to approximate when a woman is fertile are usually based on the menstrual cycle, changes in cervical mucus, or changes in body temperature.
Natural family planning can work, but it takes an extremely motivated couple to use the method effectively.
Withdrawal
In this method, also called coitus interruptus, the man withdraws his penis from the vagina before ejaculation. Fertilization is prevented if the sperm don't enter the vagina.
Effectiveness depends on the male's ability to withdraw before ejaculation. Also, withdrawal doesn't provide protection from STDs, including HIV. Infectious diseases can be transmitted by direct contact with surface lesions and by pre-ejaculatory fluid.
source: http://www.fda.gov/
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