My friend's wife wears homely nighties around the house that are somewhat transparent, especially in summer and monsoon and summer, when she perspires. Her undergarments and body become clearly visible... and this is a turn-on for all of us who drop in on weekends. Recently, I asked my friend about this and found that even he was turned on when his wife did this. At first, she seemed to do it without knowing how it appeared to us. But nowadays, we even tease her about her undergarments, and she takes it sportingly... so she isn't so innocent!