A device to lubricate a penis or medical instrument before insertion into the human body or orifice is disclosed. The device can be made from a ring that is covered with one or more membranes and contains lubricating material within the interior volume defined by the ring and the membrane(s). Alternatively, the device can be made from a ring that surrounds foam that is saturated with lubricant. In either embodiment, the membrane(s) or foam contain a penetration zone defined by any number of intersecting slits. A method of using the same to lubricate a penis or a medical instrument, such as an endoscope.