U is for Urolagnia
Urolagnia, also known as watersports. Watersports is an acquired taste, pun intended. It can be used as a method of control, degradation and just plain old kink.
A friend of FB, underhishand has just got onto special pee play items. she goes on to tell all, and puts it down as it is. Well worth a read. Linky
There are even some deliciously pervy picks of her modeling her home made piss gag.
PS if you want to make the experience a bit more tolerable for the swallower
pineapple juice makes it that much more pleasant. If its a first time attempt, try it, be nice to start