I was always told that when it comes to electro, keep it BELOW the waist. I see this stuff in gay bondage porn quite a lot. But you don’t want to run an electrical current through someone’s body close to the heart.
There is nothing wrong with fantasizing, of course. If you look closely at these pictures of Lance from Dream Boy Bondage, you might notice that he is clamped with rubber-tipped nip clamps, so there is no actual electrical current involved. In other words, what is pictured is “simulated electro” for fantasy purposes only.
Bottom line: Just because you see something on the Tumbly thing or in porn, doesn’t mean you should do it in real life.