Is the "period" excuse for cancelling a physical date real or something you girls do to dudes you don't like?

Dates was on she texts claiming she has her period cramps and cancels.

I have no idea about female anatomy so is that some lame excuse you girls normally use or something?\

why would someone use THAT of all reasons?
Is the "period" excuse for cancelling a physical date real or something you girls do to dudes you don't like?
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