I have 5 cats, 3 females and 2 males, all fixed. Well the most recent addition Sam has this pretty disturbing habit of mounting and humping blankets, clothes and sometimes our legs under the sheets. He purrs really loudly when he does this and its really quite disturbing. However I was able to tolerate it because Sam is a very stressed out kitty(he used to live in a bigger cat household and was the scape-goat for all the other cats), and I figured maybe it was his way of relieving stress. Well just recent my other boy cat, my little baby 'son' as I call him, Jinx, has started to hump too, and even play kinda rough with his sister. I am really distressed by this because it is bad behavior and I dont want my baby boy becoming a perv like Sam. Now Jinx is still in the stage where he looks really confused when he does it. Sam just does it and if you try and stop him he bites. I really need help...what can I do to stop this!?!