I agree with John on this entirely.
I do not tolerate anything other than "normal" behaviour form my stallions and never use a chain either.
Many years ago I had an incident with an Arab who had a chain on and got his foot over the line as he mounted, line went taught, pulled the stud chain and things went downhill fast.
This was also a young horse, so, after that, no more chains for me, not even in the ring, well, especially in the ring!!
The day my stallion breeds a mare in the middle of a show ring is the day he can start expecting to do just that and since that will never happen he can behave himself and keep his comments to himself.
I do have a specific place to breed the mares, though, and the stallions know if they are brought to a mare in this place they can reasonably expect to breed her, if she is willing.
I have another place where we do the "teasing" and if the mare is then willing I move her.
It is all just down to routine.
If the mare is out in the big yard, chances are his luck is not in and he has to tease her to find out, gently!!
If she is in the small yard he is on a promise!!