Just an update in case people find this thread later, I can confirm that after 4 weeks i am fully back to normal, with normally feeling and sensitivity in my penis. I notice that after about 2 weeks that the feeling and sensitive was returning.

Now have a little time to play with a few different TENS devices. Always putting the pads on in the same place, as describe (at top base of the penis, and bottom just behind the head). I have expereienced that using a constain 100hz and 200us seems to give good overall numbing results. The penis and head becomes very desensitised which lasts for over day. I have been stiming for several hours a day, for 4 days using as much power and i can take, and then upping it after a little while as i get used to it. Over the weekend I will stop stimming until feeling returns to normal. The device that I am using is a NeuroTrac TENS device , with just cheap ebay pads which I have trimmed down. I use medical tape to help the pads stay on.

So I know this is an old topic, I have just found it and was interested in learning more about it. Having had a try with it, using the method as described above numbs the penis for a number of hours. It still has some feeling, but certainly no pleasure or pain when touched. I can totally understand that in that state there is no way you will get an erection via manual stimulation - as you just can't feel anything. Had a bit of fun with the different setting and boy you can get a bit of a thrill from it, if you set the setting on too high too quick i noticed it could lead to an orgasm. Do note, I was able to get hard by mental stimulation. For me, the affects lasted for only a few hours, however i continue to play and experiment with the different settings to see if I can get affects that lasts longer. Would love to know how others have gotten on with TENS devices.