The Smell Test
Let's be honest here, if you are getting busy and there is a sudden splash of liquid out of your vagina, your first reaction will most likely be "WHAT THE HELL?" and you're going to smell it. You just will. When it happened to me for the first time, I did exactly that. Although I was aware that squirting could happen to some people, at the time, it really freaked me out because it was so unexpected. I honestly thought that I had peed all over myself and my then-boyfriend. I was absolutely mortified and wanted to crawl under a rock and die, and I believed he surely would be disgusted and want to stop. Imagine my relief when he simply stated "Wow! I didn't know you could squirt!" It was then that I realized that I had been holding my breath, and so I started to breathe again. To my surprise, there was no odor! Anybody who has ever peed will know what it smells like, and it isn't really very pleasant (unless you're into that sort of thing, of course.), and this definitely did NOT smell like urine.
The Color Test
Most people know that urine is, in fact, usually yellow in color. Anybody who has ever wet the bed as a kid knows what it looks like when it happens on white sheets, too. My squirting journey began on a white sheet and there was no discoloration at all, other than it being a slightly darker white, like a wet spot usually is. Further more, when I watched it coming out the second time, it was totally clear in color. It was like water.
The Pre-Pee Test
I did a bit of research after the first time I squirted, and there were several pieces of advice that mentioned peeing before sex to make sure it's actually squirt. So, before the second time, and every time henceforth, I emptied my bladder completely before doing the horizontal mambo, and even then, the same amount of liquid came out. Since I had absolutely no pee left in my bladder when it happened, this could not have been urine.
The Taste Test
There are several people out there, myself included, who have done the "taste test", and it is pretty easy to tell that it's not pee. That's right, I did it. Around the second or third time it happened, curiosity got to me and I licked the bed sheet (of course I made sure that it passed the first three tests before doing this). It was definitely not urine, judging by the taste of it. Now, I know what you're thinking, "Miss Meow, that's gross! Why would you taste something that could potentially be urine?!" My answer is simply, "Science, my friend. For science."
So, there you have it. From my personal experience, the liquid that comes out when you squirt is not urine. Feel free to try these tests on your own if you're still not sure. I am sure your partner won't mind the extra practice trying to make you squirt. You know, um, for science! Thanks for reading!