I tried it last weekend. My partner tied me naked spread eagled in the back of the truck on my back. I was plugged and a doggy shock collar was on my genitalia. The cuffs were set up so that I could not release myself. The tonneau cover was closed and off she went shopping. It was thrilling to hear people close by as I lay in the parking lot. At random times a mild pleasurable shock would shock me. I would like to expand the idea and experience. Has anyone tried something more elaborate or different? Any other ideas.