I can Promise you, in 90% of videos you will find, its Piss. You just happen to be lucky enough to have the real thing, so that means you WIN.
Iv been with only one girl that squirts, and thats only when she cums REALLY hard, at first it was only during reverse cowgirl with a vibrator in her ass, but she eventually ended up doing it about 25% of the time she came hard. We were really young then and since then she told me that she stopped doing it hardly at all after she turned 20...so that may be a factor.
As for taste...with her it was almost totally tasteless, very very slightly salty. Not unpleasent at all, but just....odd.
