lurkette's on a birth-control pill that she can use to skip periods. She usually only has periods once every three or four months, and she usually times for when it's convenient.
Even if I didn't know in advance, I'd have one big clue. We normally sleep nude. Except when she's having her period, in which case she wears panties to bed. So it'd be pretty obvious, if I were looking to make a guess about it.
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