One Zika oddity is that infected males retain the virus in their semen nearly 10 times longer than women do in their
vaginal fluids — 180 days rather than 20, on average — making males much
more likely to transmit Zika sexually than females.
Data such as days of menstruation, PMS symptoms (from mood swings to breast tenderness),
vaginal fluid secretions, basal body temperature, ovulation, libido, and
more can all be put into the app.