The Campus Theatre in SF used to have all kinds of raunchy little contests usually on long weekends (Labor Day, Memorial Day) to get guys into the place. One of the events was a "bull milking" contest. It was a team event. A milker and a milkee. The had a heavy rope stretched across the stage about 6ft. high. The milkee or bull stripped down and went on the stage and grabbed the rope with both hands. If he took his hands off the rope his team was disqualified. His team mate the milker got in front of the and bull lubed his cock up. That night I think there were 4 teams competing. The bulls were lined up across the stage both hands on the rope. The milkers were in front of them. The MC blew a whistle and the milkers went to work on their bulls. The first team to get "milk" was the winner. I think the winning team got $100.00
My milker an me didn't win but we still had a good time. The Campus closed about 10 yrs. ago. I don't think there is any place in SF like it anymore.