If every woman had a menstrual cycle twice a day at high or low tide one might suspect some correlation. They do not even coincide with a certain phase of the Moon nor do they appear in concert. Where's the supposed relationship?
The variance of gravity at the Earth�s surface contributed by the Moon is less than one part in a million, like farting while going to the third floor in a lift . . . not to mention that the Moon does not even exist!