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Re:Once it was easy to be obscure, but technology has ended ... by DoreenMichele on Thursday April 18, 2019 @03:14AM (#19689302)
Or her data collecting menstrual calendar isa sending back info (yes this actually exists).

Not only do such services exist, they are already selling the data and for exactly the purpose you describe iirc:

https://news.ycombinator.com/item?id=18988289

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