The G Spot and other recent discoveries about human sexuality by Alice Kahn Ladas, Beverly Whipple and John D. Perry

http://www.amazon.com/Spot-Other-Discoveries-about-Sexuality/dp/0805077596/ref=sr_1_1?ie=UTF8&s=books&qid=1269572473&sr=8-1

My copy is from 1983. I'll try to find the relevant passage and put it in this post.

I read this earlier and thought some might find it interesting.

American sex guru and co-author of the original G-spot book, Beverley Whipple says that typically, the amount of fluid released is around “half a coffee cup-full.” Some women can produce a quart of liquid at one time from their bodies!

Until the 1980s, any doctor actually aware of the female ejaculation “phenomenon” assumed it was urine. As a “treatment,” they would recommend exercises to build the pelvic muscles. In 1982, the above mentioned G-spot book suggested the fluid wasn't urine, but rather a “juice” secreted by the Skene’s glands, tiny structures that drain into the urethra which are said to be the female equivalent of the prostate, although their size and shape differ greatly and their exact function is unclear.

In 2007, Viennese researcher Dr Florian Wimpissinger (his real name) affirmed this, additionally finding that the ejaculate from two women he studied was chemically different from that of urine. In particular, it contained more prostatic acid phosphatase (PAP), more prostate-specific antigen (PSA), and also some glucose.