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If you dare to go down the "natural" path - do some research on BabyComp. It's a small "computer" who measures her body temperature each morning, and she pushes a button to indicate her period. After 3 months it's very accurate. Each morning she will be woken by an alarm, put the temperature sensor under her tounge for a minute, an a green/red light wil show - telling her to "go for it" or not (Condoms are for those red days)
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