Tests offer high-tech ways to find your most fertile days.

All sexual contact must be avoided on fertile days of the cycle.

Researchers have found women tend to dress to impress during their fertile days.

By the late 1960s, the rules for identifying fertile days had been established and teaching centers began to be set up around the world.

Your most fertile days for the next three cycles are:

This calculator helps you predict your most fertile days of the month.

The study participants typically abstained or used condoms during the fertile days of their cycle.

Most women probably notice nothing more than a "funny little feeling" of lust during their fertile days, Haselton said.

Use of a barrier or other backup method is required on fertile days; otherwise the couple must abstain.

Picky female pandas have only two or three fertile days a year when they might even consider mating.

If your religion permits it, use a backup method for the first few months until you learn when your most fertile days are.

The study found that on the six most fertile days, intercourse was 24 percent more frequent than on the other days.

With only three fertile days per year, an ill-timed panda "headache" can be a major problem for species survival.

For these women, the rhythm method formula incorrectly identifies a few fertile days as being in the infertile period.

Find your most fertile days.

ClearPlan One Step can detect your most fertile days.

The failure rate of fertility awareness varies widely depending on the system used to identify fertile days, the instructional method, and the population being studied.

Many of them had tried to practice "rhythm," the one method of birth control the church accepted, abstaining from intercourse during the wife's fertile days.

It is the occurrence of ovulation which determines the disposition of the fertile days within the menstrual cycle.

Fertility awareness methods involve determining the most fertile days of the menstrual cycle and avoiding unprotected intercourse.

Whilst fertile days are limited to a few days a month, STDs can be contracted on every day of the year.

This was a time for celebration; of the pleasures of the flesh and the sacred conception of life in the fertile days of early summer.