There is precum and there is piss. I have a penis, I precum. This is piss. Before you respond with cowper gland and the colour of the liquid, the performers drink copious amounts of water and it shows. The cowper gland is not a bladder. Also before you mention women doing it...it's just piss. Nothing wrong with piss. It is not a magical, water like liquid from a mysterious undiscovered organ. It is just piss. Deal with it.