Re: Sex question.
Well, my wife and I used the rhythm method for a while, so here's what I think based on just a little research.
Assuming good fertility:
During cycle prime time, like 20%
During cycle off time, around 5%
During like, ewww, her period, like <1%
Weighted average if you don't know where in her cylce she is, its probably just under 10% I'm guessing.
If fertility is low for one or both parties, these numbers would drop by a factor of ten or more.
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