Well I can only speak for my own experience. My tom was really sweet, but he didn't have enough girls and started mounting my 5-year-old when he was playing in the dirt.
I said, "GET OFF THE GROUND! What are you DOING down there?"
His reply, "I am building a nest to lay eggs in!"
....So I...
Um...I have a bajillion chickens in with my bajillion turkeys. Its a small run, too. Other than one tom trying to get jiggy with his chicken broodermates, I never had an issue.