http://en.m.wikipedia.org/wiki/Female_ejaculation
I understand Wikipedia isn't the most reliable source, however, I find it more reliable than the study in OP. As grits mentioned the study is quite irrelevant due to limited test subjects. There are so many opinions on this subject and I will be bold enough to say, those who are adamant that it is urine are ppl who who still want women to feel shame in their sexuality as some cultures still practice female circumcision where they cut the clitoris off when the girl becomes a "woman" to reduce enjoyment due to arranged marriages.. the western culture refers to female genital mutilation but that doesn't mean we still don't attempt to shame a woman who loves sex and is confident enough to enjoy it.
In my own experience, I squirted for first time when I was 27 and I was embarrassed but also felt like I had an out of body experience. I felt so sexually liberated and thought, "omg what have I been missing," and here I am in the business. ..lol... money is certainly the motivation but I still have fun.
Female ejaculate does come out of the urethra but that doesn't mean its urine. I think sometimes when overly worked up or attempting to force a woman can lose slight control of their bladder but it's still not 100% urine. Other studies have concluded that the pH balances between female ejaculate and urine are completely different. I have done the research due to my own experience and being freaked out but refuse to believe it's a filthy act or that I'm peeing on my partner. if this were the case I'd be drinking 20 gals of water to use the bathroom all day and have no need for a man whatsoever. There is a difference between squirting and cumming hard, though.
Oh, vagina, how thee confuse the minds of men.
Aaaand I'm slightly bitter I was not asked to participate in this study.
This is the opinion of an uneducated woman.