This is a good topic lol. I can't really think of any way to create the opportunity. It kinda comes naturally. I think hanging out with friends in a house is a good one. Someone is usually bond to take off their shoes to relax. Or if your going to hang out over someone eles house theres a pretty good chance they wont have on shoes. Ive def tickled alot of womens feet just going over their house to hang out. I have alot of female friends.