The one day a month when women most love sex, and other fun facts about making whoopee

When it comes to having better sex, getting pregnant, or avoiding pregnancy, women have a new best friend: their smartphones.

Fertility-tracking apps like Glow are quickly becoming the newest addition to a woman's fertility management.

Glow was founded in 2013 by PayPal co-founder and investor Max Levchin.

In the two years since it launched, Glow has helped with 150,000 pregnancies, according to new data it shared this week. All told, Glow has logged the data for 47 million female fertility cycles. It also tracks things like mood, frequency and quality of sex.

So it analyzed the data and came up with these interesting insights about women's sex lives.