The Colours Girth is perfect for  strap-on play of about any kind, Girth's widespread circular base anchors into many O-ring or open-front harness systems. If strapping it on isn't your cup of tea, you can easily stabilize that same base against most smooth, nonporous surfaces because it's also a suction cup. Press it firmly to windows, walls, countertops, or floors for a hands-free ride.