Guys, it's not because she has a tiny bladder. Well, probably not. It's because she's trying to prevent UTIs. She's a smart, sensible woman, this one. She's trying to ensure a lifetime (or, a few more weeks, depending on how much she likes you) of infection-free sex. Shout out to that! Plus, stop being such a pussy about the cuddling thing. She'll be back in two minutes.
Cut cuddling short so she can go pee.