! My one gelding who was a breeding stallion until he was 10 yrs old, now hates mares! When he was a stallion, he hated geldings, now that's all he regards as friends, he isn't into anything sexual anymore, been there, done that, knows the difference. Well technically, he really doesn't like any other horses at all other than his son he is pastured with, he ignores other geldings as if they don't exist and pins his ears at mares, even his own daughter, and she hated his guts. She would have loved to give him a good kick if she ever got a chance, but was in love with her brother & vice versa.