``It's a very embarrassing story, but since I turned 30, my physical condition has changed, or rather, my body has changed, and I started to feel a tingling sensation in my body, as if I wanted something. That's what happened...'' says Yuko Koyama, 30 years old. Her occupation is a stage actress. She told her boyfriend about this change in her body and even asked him to ``increase the number of times she has sex.'' Her boyfriend also reciprocates her feelings and she is trying his best, but she feels sorry for him as he seems to be forcing himself on her. Thinking that she would be alone, she watched some adult videos, and found out that she felt beauty in the sight of beautiful women in trouble, and that she was wearing a different type of video.