My uncle Ted had a stud farm. It was a ranch were he bred stallions and mares, and then sold of the colts.
I remember visiting it one year when I was 14. I hadn't ever seen him breeding the horses, as they usually planned my visits carefully enough the Uncle Ted would put everything away. Clearly my parents had forgotten that time. As we drove down the long drive to uncle Tads, I watched with wide eyes as a male stallion with a full 3 foot erection, climbed on top of a mare.