First time I used a tens was for my back, and having a pervy mind, thought I could use it elsewhere. Considering this was back in the 1990’s, long before the internet, I soon discovered it to have incredible effects on my cock.
I used two pads, one at the dorsal side of my cock at the base, the other stuck behind my glans over the frenulum. I started on the low setting, using tens setting, and within no time my cock was extra erect. I could vary the “wave” effect, and soon I was shooting spunk like no tomorrow. Eventually, I placed the pads in different places, one on the perenium just behind my balls, the other at the dorsal side of my cock just under the glans. Different places give different sensations.
During visits to pro dommes, electrics were part of the session.A lot more powerful than my 9v tens, and the sessions were more motivated to cock torture, but always finishing with a shattering orgasm.
Play with it,see what you can do, buy other attachments like the conductive rubber rings etc.
I use mine for edging for several hours while watching porn, or for a quick burst if I need to cum quickly