My siamese, Tuva, would do both duties on a towel if I left him the option! I figure he thinks he is too good for walking in sand or dirt or whatever and is deserving of the best (I came home yesterday and he'd pullled the top sheet off the bed just to pull it into a ball and pee on it then ball it up tight. As soon as I saw it I knew it was dirty laundry. Why? Who knows? He just now and then will do that. The towels, no chance- I don't leave them within his reach- he did that as a teenager so I got in the habit immediatly to keep them where he couldn't pull them down (I had been gone a week when he started the bad habit).