Yes but not as often as you think.
As for pee, yes, some women loss control of their bladders when they cum. It is one of the reasons why a chick should piss before hand other than just comfort. But in the end I wouldn't rely and looking vaginal ejaculation as a sign of orgasm. Most don't visably ejaculate and a chick can get "creamy" even if they do not come but just come close or really excited.
But ya, having a chick cum will ruin most porn for you because then you will know that 99% is fake.