This brings a curious question to mind.
What if....
What if you were at a riding stable, and someone elses mare showed obvious sexual interest in you, turning her hind end toward you, winking and backing up against you, even squirting precum shes so turned on over your scent.
It's her choice to want to be sexually satiated by you, she essentially "picked" you, but she belongs to someone else.
What if this mare never gets any sexual release/relief, and is just forced to carry around sweaty overweight riders all day, hurting her back. This could potentially be the case, ask yourself, would it be so wrong if she chose you, and you could understand what she needed, to improve her life, and overall feeling of wellbeing. Would that actually be so wrong?
It's an interesting thought.
This would be the free will of the animal vs human property rights over another living thing. Interesting.