New partner pees herself during sex. What to do?

Anonymous
My new partner dropped me a hint or two about this during the dating phase. She is terribly insecure about it but she can't help it. During her orgasms she literally pees all over the place. Once it starts, she can't stop the flow. It's not squirting as it strongly smells like pee and it's yellow like pee. Tastes like pee. It is pee!! I thought she was paranoid and I insisted we first had sex on my bed. Now the entire mattress has a huuuge pee stain and I need to change it as the entire house stinks. She told me she warned me and I am lucky as she used the restroom just minutes before or it would be a lot more. In fact she did. I told her how did her past relationships got through that and she said they usually had sex in the shower or the floor and cleaned up after. Anyone even had to deal with something like that? If yes, what did you do?
New partner pees herself during sex. What to do?
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