Hi
I am a very confident woman that knows my bodys erogene zones. I know by experience that I get the most intense and longest orgasms ever by using benwa balls. The longest orgasms I´ve got from ben wa balls is about 20-35 minutes and my entire body shakes as from an electric shock. I mostly use custom maded benwa balls made of silicone and press them so hard that the silicone balls finally are pressed into an oval shape.