Letting Your Body Tell You When It Is "Safe"
For many reasons, religious and health, some couples use fertility awareness as their main method of contraception. Also known as natural family planning or periodic abstinence, fertility awareness entails not having sexual intercourse on the days of a woman's menstrual cycle when she could become pregnant or using a barrier method of birth control on those days.
Because a sperm may live in the female's reproductive tract for up to seven days and the egg remains fertile for about 24 hours, a woman can get pregnant within a substantial window of time -- from seven days before ovulation to three days 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.
In the book, Taking Charge of Your Fertility, author Toni Weschler thoroughly explains the fertility awareness method which will allows you to enjoy highly effective and scientifically proven birth control without chemicals or devices. The book is also very popular with couples attempting to achieve pregnancy.
How effective is withdrawal as a birth control method?
In this method, also called coitus interruptus, the man withdraws his penis from the vagina before ejaculation. Fertilization is prevented because the sperm don't enter the vagina. Pregnancy is, however, possible if semen or pre-ejaculate is spilled on the vulva.
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.
Planned Parenthood notes that this method requires great self-control, experience, and trust, and that withdrawl is not appropriate for men who are likely to have "premature" ejaculation, teens and other sexually inexperienced men.