Question: Hello, my five year old mustang mare shares a paddock with my sisters gelding quarter horse who is six. Earlier today i went outside to water the them, andthe gelding drank first and then the mare did and after she finished drinkingthe gelding stuck out his man part. The mare put her mouth in the water andstarted splashing around. I thought she was just playing around. But then shecurled up her lip. and splashed around some more. When the gelding sucked backin, she stopped. What was she doing?

Answer: The mare was most likely just playing in the water. It is common for a gelding to drop his penis partially while resting, so the behaviors are very unlikely to be related in any way.