During arousal or orgasm, some women release a clear, odorless fluid from their urethras. Lab analysis has shown it to be, in varying degrees, chemically distinct from urine. In many cases a woman who ejaculates does so only when Graefenberg spot is stimulated. J.L. Sevely and J.W. Bennett once reviewed all of the literature on female ejaculation -- from Aristotle to Masters and Johnson -- and reported their findings in The Journal of Sex Research. They concluded that the female possesses glands similar to the male prostate (the male prostate secretes the fluid that constitutes much of the male ejaculate). The female prostate glands are located near the opening of the urethra and apparently produce a fluid during intercourse. In most cases, this fluid mingles with normal lubricating fluids, but apparently in some women it is more pronounced. For more information, see The Good Vibrations Guide: The G-Spot by Cathy Winks.