That is when the "Simulation Sex Toy" into the vagina, with a waist circle skills rotary motion. This movement can be a good natural friction to the vaginal wall. Law suitable female host, by the couple take turns operating, alternating rotational friction, so the two are not too tired, can persist longer. "Simulation Sex Toy" The advantage is that the two close together, help shade the roots of intense clitoral stimulation, so that both husband and wife at the same time get intense sexual pleasure. And because the female superior, easier to join the sex toys, such as the "Simulation Sex Toy" is placed between the two, can produce wonderful vibrations in the binding site, so that both pleasure are doubled.