I did this as a young girl when I had time at home alone....I would undress and go to the living room naked and hump the arm of the sofa.....it felt so 'naughty' to be nude in other rooms of the house, and I always reached such powerful orgasms masturbating in 'forbidden' rooms.....If I knew I was alone for a while, I also loved to walk around the house naked, then go to the sofa again for more humping...x