I just picked up a pretty nice TENS unit (to use for their intended purpose) but then it dawned on e that it might be a great toy for masturbation as well. I haven't had the chance to try it out yet. I've done a little online research and it looks very promising. How many of you guys have used this for your private playtime? Do you have any tips for best results ( where best to place the pads)? Any do's and don'ts or just want to share your experiences?