As the title says, I'm wondering if an average sized male horse could effectively penetrate a man / woman analy without any preparation or experience. I and someone else have different opinions on whether the horse would be able to push it in given the size of a horses penis and the small size of an anus. If a horse was able to penetrate, how would it go, would the horse be able to thrust its full depth, is stopping the horse or pulling out possible once it's in? What is the average diameter / circumference of a horses penis tip.