Hello!

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I remember reading somewhere that there is a "6 years cycle" in a woman's body and psyche that affects every relationship and is the reason why they all start to fail when approaching this mark. I remember that I also read a scientific paper talking about this and how female hormones begin to shift nearing these six years, hence the "cycle".

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I'm trying to explain this concept to a friend of mine, but sadly I cannot find the references... Could you please point me to sources explaining all this? Thanks a lot!