This could be a sign that your cat has pent up energy. Exercising your cat helps release that energy and stop the humping behavior. If the humping continues, it could be any of the other reasons we covered.
Pet Owner's Online Compendium
This could be a sign that your cat has pent up energy. Exercising your cat helps release that energy and stop the humping behavior. If the humping continues, it could be any of the other reasons we covered.