Why do girls say they have to pee?

I was talking to my coworker (I kinda like) and we are having fun. She randomly decides to tell me "I have to pee." For context, we work in a restaurant, so to be funny I just told to her to use one of the cups lying on the counter. She laughs and tells me to shut up, but still doesn't go to the restroom. Two hours later and again we're talking she tells me she has to pee. This time I just look at her face like okayy?

Why do girls say they have to pee?
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