My T doesn't allow feet on his furniture, which I really appreciate (and can understand considering the amount of foot traffic his couch could theoretically see). I don't want to sit where someone else's feet have been if I don't know who they are (like I said, home and family is a different story). I kind of liken it to at school when I tell students not to sit on the cafeteria tables or the tops of desks in the classroom. No one wants to eat or work where your butt has been. It's just gross to think about.