When I was about 11 me and a group of my friends would walk through the woods behind my house to the edge of a farmers field where they kept their cows, the cows were super friendly and would come over to the fence for pets or feeding if you had some of the love grass from the woods.
We used to either get them to turn around with their asses to the little wire fence, or we would just hop over it and use buckets or tree stumps or something to fuck them. We did it for years, we would all just fuck whatever cows would come over, usually we would all just use the same one, but on occasion we would fuck multiple.