For women trying not to get pregnant, life should be easy. Conception can only happen 12-24 hours after ovulation. Sure, sperm may last as many as 3-4 days in the genital tract, hanging around for the ...

Already the black sheep of birth control, the rhythm method--which is based on predicting a woman¿s menstrual cycle accurately--may be even more unreliable than previously thought. Statistically, it ...

The Natural Cycles app aims to prevent pregnancy by evaluating a woman’s daily temperature and menstruation data. The app — which uses this information to calculate which days a woman is at a high or ...

Rise and Shine Early birds may have an edge over night owls at work and school -- not just in the morning, when their bodies' internal clocks help them get on task earlier, but through midday. That's ...