I have heard both sides of this argument before. I have never done it myself, but find it interesting. Deer are curious by nature, and from the farm country where I live, people piss in the fields that deer frequent all the time. Do you think they can tell human piss from that of any other animal? (cows, horses, cats,fox, coyote) I guess if you have to go, it sure beats pissing down your leg.