That's because a woman's hormones have a profound effect on everything that impacts her wedding - her mood, energy, confidence and even how in love she feels with her betrothed. When women know how their hormones make them feel every day, they know the best day of their cycle to pick for their big day.

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The morning is when a man's testosterone peaks in his 24-hour hormone cycle. And Day 13 is when testosterone peaks in a woman's monthly hormone cycle. When these two hormonal peaks intersect, they can set the stage for the best sex all month long.

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