The least priced and most efficient birth control, according to research, is long acting.
Because abstinence must be followed for longer than one or two days — it might require up to a month without sex to prevent unwanted pregnancies — the rhythm approach is often around 80 and 87 percent successful at preventing pregnancy.
Latz recommended abstaining from sexual activity for eight days, starting five days prior to ovulation and adding an extra three days for safety. This advice applied to women with regular menstrual cycles. Latz, a fervent Roman Catholic, promoted this technique of contraception as being more in keeping with the guidelines of the church.
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