it’s about the way the animal is built, not whether it has a penis.And to be specific, ALL male horses aren’t stallions.And I can promise you that none of the horses in these pics are stallions. I use to ride in the Houston trail ride. Probably the biggest in the country and stallions ARE NOT allowed. They can be mean dangerous beast. Most male horses are geldings. I’m 55 and been saying it all my life. And I’m from the country so I know the difference. LOL.