Clear The Calendar! These Are The Best Nights For Sex

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And other hormonal secrets!

Weeks 3 to 4: Prep for your period

Hasta luego, bad habits
It might be a good time to put out that unsexy cigarette. Estrogen normally enhances the warm fuzzies you get from indulging, but increased progesterone makes it easier to resist, researchers from the University of Minnesota say. Bonus: A healthy body equals more energetic sex.

Relax, girl
You may not sleep as well as you do the rest of the month, due to rising progesterone levels, a review in the International Journal of Endocrinology indicates. Wind down by getting your guy to give you a nice, looong massage.

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