I have no idea why, but I once asked my wife to lay on the bed with a towel under her and pee. When she did, all sense just left me and I went down on her. She was disgusted and couldn't believe I did that, even though she wasn't peeing at that moment. I was really turned on by this, and started thinking about how much I would like to really taste it, as I really didn't get much of a taste that day.
Several weeks later I worked up the nerve to tell my wife I had been fantasizing about her peeing in my mouth while we did a 69. She reluctantly agreed. She's no prude by any means, we had been having anal sex regularly for about eight years. When we finally did it, I wasn't really prepared and she pissed all over my face, up my nose, in my eyes, and in my mouth. As we got in the shower to clean up, I can remember saying, "what the hell was I thinking?"
For some reason I continued to think about my wife peeing in my mouth. I told her I wanted to try it again. She still wasn't keen on the idea, but again agreed. She laid on her back, and I spread her lips. I placed my mouth over her urethra, and when she was finally able to relax, I received my reward. This time, it was an incredible experience. The thought of my wife laying on our bed, peeing in my mouth, and me drinking it all was so incredible to me that I shot off all over the bed without even touching my cock.