That's a shame. I use to work at Cirilla's and they had a body wand with the e-stim thing. It was almost $200 so I never bought it but it got me obsessed with tens units and this kind of play. Did you try turning it down lower? Maybe you should, and place them on your inner thighs! Still a sensitive area, but not awful. Try relaxing and then turning it on, then jack off? Sometimes you just have to relax and mentally explore for things to work. At least I do. I wouldn't give up on them just yet though.