For some mistresses it seems to be the thing to urinate in a guy's ass or rectum!
Maybe "some mistresses" discovered that their subs are not humiliated by bathing in or drinking their golden showers? Just a guess... never heard of this.
Well, the two mistresses I have seen or read of the different golden shower are on the more extreme edge of things . . . but it definitely happens, if we believe video . . and is done by some mistresses who are known and travel nationally. Just a bit of a surprise, which is probably what they intended for some of their subs!