It is mainly pee though; there is some fluid excreted from the skenes gland mixed into it, but its mixed with pee from the bladder. Even webmd will tell you this.
Lot's of games give the player the option of where to stick it, and even where to cum. There's hardly ever a vaginal cumshot in the Fuckman series, it's not like there's going to be child support payments in nine months.