They are, but try to convince some dude who is hell bent on making it happen that it isn't is more difficult than climbing Mt. Everest. Squirting/peeing and female ejaculate are not the same thing, though.
I accidentally squirted ONE time during sex, uncontrollable and involuntary on my part, I just had a really full bladder from all of the beer I drank that night. The first few times it was a novelty but now at this point hubby BEGS me to try to fight through it or just go pee in the toilet. It's messy, it does have a faint odor that lingers and picks up other odors if you don't launder fast enough. It makes my bladder and urethra so sore when it happens and has weakened my pelvic floor muscles to the point where if my body sends the signal to pee I need to get on the toilet ASAP or I'll pee my pants. I've never had children, so that is definitely not in play here.
Whenever someone challenges me in my room about squirting versus peeing I always respond with one question and wait for them to answer.
"So if SQUIRT isn't PEE, then tell me why chicks who sell squirt shows are pre-gaming with a literal gallon of water with a count down to when the show can begin."
The answer is they know their body well enough to know how long it takes that water to pass from their stomach to their bladders. Over the years I have grown to think of squirting as a defense mechanism of some kind but its exact purpose alludes me. And I'm not a doctor or a scientist but our bodies do all kinds of crazy things to protect us from things it deems harmful.
(I don't mean to threadjack. This happens to be a topic I'm ridiculously passionate about when it comes to sex education.)