Are people with access to spectral analysis just bad at sex and have never seen it?

I mean some studies seem to say it’s basically piss

Conclusions: The present data based on ultrasonographic bladder monitoring and biochemical analyses indicate that squirting is essentially the involuntary emission of urine during sexual activity, although a marginal contribution of prostatic secretions to the emitted fluid often exists.

https://pubmed.ncbi.nlm.nih.gov/25545022/

I haven’t really cross-analyzed the tests or anything but this is what comes up when searching for it