What a definite turn-on when my wife masturbates in front of me. It is even more exciting when she is "caught" pleasuring herself. When we were first married, She would not admit that she had ever masturbated. As we grew together, we would share our past experiences and as it turns out, there were times when I would come home early and nearly catch her masturbating. She would always 'get it together' before I got into the house. I never knew! Some time later, she would share these 'close encounters' with me and what a turn-on! She told me that nearly being caught was extremely arousing for her and that lead to some wild and exciting sex later that evening.
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