There’s a lovely scientific history of Female Ejaculation over at Scientific American.
1) Yes it’s real.
2) No, it’s not urine.
3) Yes, it’s hard to replicate under sterile laboratory conditions for some odd reason.
And on a person note, yes it’s very surprising to get a face full if you aren’t expecting it.
Now it’s time to get to work on part two of this research, which I’ve titled “Doctor Tungsten and the all Lesbian Bukake Brigade.”