Do women who have sex more often tend to pee louder?

No, having sex does not make you pee more loudly.

We've been made to believe that when women have sex our passage becomes bigger and maybe that's why you thought that if the passage is bigger (not that its the same passage), the pee just falls right out.

But, as we have all said before, having sex does not change the shape of your sexual organs (or any other organs)!!