It has always been obvious to me that squirting out of the urethra had to be coming from the bladder (pee). There is no other explanation for the quantity and velocity of the squirt. Now of course we all get soaking wet and have a teaspoon of female ejaculate when aroused but the true squirt, you know, the one that sprays you in the face, has no other logical explanation to it's origin and what it consists of.  
We have dissected enough bodies to know there is not a secondary compartment that fills up with some magical fluid and then dumps into the urethra at the last second with all that force.  
For New Years Eve this year I went to a swing club in Philly. They had a squirting contest. The first girl to go sprayed the entire front row. A stream of 5 ft or so. The place certainly smelled like pee after that

Uh oh: careful, some of these ladies rely on their "squirting" as an ad!

 
Look for "Real Squirting" ads all over Vegas coming up! Ha

 
PS: I don't pee on my lovers unless they ask for that, LOL

this will be like finding out about the tooth fairy.

Don't want to get in the middle of the ladies pissing match-pun intended, but here is my experience.  

I have been with two ladies (civies) that squirted. One was very limited in her sexual experience and didn't have a clue what even happened. We were in CG and all of the sudden I got a very wet warm feeling running down my boys and crack. It was a lot and very noticeable. She thought that I had urinated inside of her. You guys know how hard it is to get a stream going when your arroused, and this was a geyser. Couldn't have been me. Didn't smell like urine but didn't have the lubrication consistency of normal "arousal" secretion. As I have no vagina, I can't comment where it came from but it was certainly NOT planned by her. It happened naturally and she said she didn't urinate.

Second lady was semi nympho. She liked to squirt and said any woman can do it. Just need to learn how. Same as an orgasm. She said it was not urine and all I can do is believe her because she knows her body better than me.

PS: I'm not into water games. These two experiences just naturally happened. First one actually kinda freaked me out.

I have often read about women learning how to squirt.  That doesn't make sense to me.  That implies that squirting is something other than part of an orgasm.  In other words, it is a gimmick.  Or just peeing, controlled or uncontrolled.

Can anyone explain or clarify