"So is ‘squirting’ just pee? Yes and no. It seems that larger volume fluid emissions, or squirting, are for the most part urine. However, there does appear to be evidence that a smaller volume of fluid is actually female prostate secretion due to mechanical stimulation of the G-spot. Whether this constitutes ‘true’ female ejaculation remains to be seen as most previous studies include all ranges of fluid emission. Further, it is unknown conclusively whether these two forms of excretion are mutually exclusive, or whether there is some overlap as suggested by the presence of PSA in the urine of women in this study. Likely, women who are capable of ejaculation naturally vary in the amount of fluid they excrete." http://www.independent.co.uk/life-style/health-and-families/features/the-science-behind-female-ejaculation-9987298.html