Karma Vibrating Strapless Silicone Strap On Dildo Black. Karma is a strapless vibrating dildo that is designed to keep one on one sessions hands free without adjustments or buckles to get in the way. The wearer can use either the PC muscles or the sphincter to hold Karma in place while they thrust. As you move back in forth, this exciting strap on will offer exciting stimulation to both partners, simultaneously! This tool features an angled, bulbous tip for intense internal stimulation coupled with powerful vibration. Just twist the base to enjoy multiple speeds.