There's a few products out there (one is called RigCalm) that might help - but people have mixed results from what I've heard.
My horse is in all likelihood a proud cut gelding - he has a strong interest in mares, will try and act up when they're in heat and is super territorial, aggressive toward alpha geldings, and a whole bunch if other stallion-like behaviour. RigCalm isn't available over here in Australia so I just treat him like a stallion - he gets a paddock to himself, I never turn my back on him, keep full control of him around mares and don't let inexperienced people handle him. He requires regular reminders of who's boss but once he's been put in his place he's a complete doddle, and a sharp reminder will have his mind back on the job at hand if by chance he's distracted by some passing hussy mare.
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