Although most women might be surprised to hear it, women, like men, can ejaculate fluid during orgasm. This is thought to be related to an orgasm triggered by the Gräfenberg spot, or G spot, a very sensitive area on the front of the vaginal wall, about a third of the way up from the vaginal opening "on the way" to the
cervix. One survey of 2,350 women found 40 percent reported having some ejaculation or fluid release during orgasm. Additionally, 82 percent of women who said they were aware of their G spot reported fluid release during orgasm.
This fluid likely comes from small glands located on either side of the vaginal opening called Skene's glands, which seem to act in women like the prostate in men (the prostate provides the fluid for the male ejaculate). In fact, some researchers have suggested that Skene's glands be renamed "the female prostate."
http://www.healthywomen.org/content/ask-expert/1369/female-ejaculation