I don't really have any interest in being peed on or peeing on anyone else. However, I did once pee on cam for the guys in a pee fetish Yahoo chatroom. They kept complaining that there were no women in the room and definitely no women in there willing to pee on cam. It turned me on to know that I was turning them on.

You DID answer your own question. One big reason urine is darker at times is because of a person NOT drinking enough water. The more water you have going in (drinking, in other words), if your kidneys are working the way they are supposed to, the lighter color your urine will be (also the milder the odor unless you've been eating asparagus or other foods whose odors tend to come through in your urine).

I have never urinated while masturbating; spurting from the G-spot is another story.

No, I've never peed on my partner with or w/o their knowledge.

If I knew that watching me pee or peeing on him or her would really turn them on, I would be happy to oblige.

__________________
Communication is the key.