Only the first scene is really worth watching if you are just interested in squirt, where it's non-stop. The others have a small amount, but the lesbian sex is nice.
It's all pee, they rub to try to disguise where it's coming from. first scene has plenty of shots of it coming from the urethra, just run at 1/4 speed, pause and step through to see it. The whole squirt gland is BS, even the few articles that try to describe it say it only could produce a small amount, not the liters Adriana produces.