Embodiments of the improved stimulation device include a cup and a driver. The cup has a cavity surrounded by a rim. The driver comprises a plate disposed on an underside of the cup, a cam disposed adjacent to the plate, and a motor mechanically coupled to the cam. The driver is configured to intermittently vary a volume of the cavity of the cup from a first volume to a second volume without returning the cup from the second volume to the first volume. In some embodiments, the cup returns from the second volume to the first volume, in between intermittent varying from the first volume to the second volume, due to the resilient nature of the material of the cup and/or the configuration of the cup. This varying of the volume between the first and second volumes creates a pressure field in a chamber formed by the cavity and a user's skin.