Dude, other parts of that set "prove" that Tiffany can give birth to tv remotes and cellphones ("Dad, where do cellphones come from?")
1. Read up on it, and more than just the cornholes that spout off with that kind of bullshit. (including the "Lurking MD" - what do you call a medical student that graduates at the bottom of his class? "Doctor" Piss off, Doc) Remember, it wasn't all that long ago that any sort of female orgasm was regarded as a medical fallacy.
There's far more going on than just piss, but there's no money in that research and the mechanism seems to have been difficult to figure out. Longstanding problem, the scientists have to figure out what's already happening, even if they think it shouldn't. Never having seen something doesn't mean it doesn't happen, and plenty of us have plenty of experience with it.
2. You'll need to actually have sex with a female, who squirts, and be good enough at it to actually get her to do so - there's techniques and she may already know what to do. Some are easy, some are not, some seem to be impossible, and I think some think they're going to pee and hold it in or will make you stop (tell them to let it go, and always put a folded towel under their ass). You know, just like some guys have tiny dicks and some guys have dicks the size of a kid's forearm, most of them aren't going to spray a quart across the room.
3. Sex IS nasty, if you do it right. Get the fuck over it. If you have a hissy fit because some liquid came out of her pussy when she came, you probably won't get any more and you'll fuck her up for the Real Men. You can complain if she shits on you though.
-CB