Found this on Wikipedia:
"In the United Kingdom, the British Board of Film Classification has banned films alleged to show female ejaculation, claiming that the expert medical advice they received informed them that there is no such thing as female ejaculation, and therefore it was deemed to show urine. They later stated instead that they do not take any view on whether female ejaculation exists, only claiming that all examples they have seen thus far during classification have been urination during sex."
Full write-up:
Female ejaculation - Wikipedia, the free encyclopedia