The well-known expression ''there is no room for a third'' may be a reality in part, but in this case the third is extremely voluptuous and specially designed to fit... everywhere!
We are of course talking about unique sex toys and vibrators for couples, which give pleasure to both participants, thus intensifying the stimulation even more.
Their special shape allows for vaginal penetration easily and simultaneously with penile penetration, offering its stimulating vibrations to both.
The contribution of a wireless controller or an app - which most of them have - is highly convenient and makes handling them very easy & simple, while choosing the material and method of vibration is an important process, but highly fun!