I dunno how much I have to add to this one… My first thought when reading this question was that it sounded dangerous to me to use an electric power when your mind’s, like, clouded by lust. Especially since Kaminari seems to have some trouble controlling the voltage output, I figured he’d run the risk of using too much and causing injury or worse. His anecdote about Kyoka towards the end is mostly indicative of his dumb impulsiveness. Kaminari definitely strikes me as the type of lover who’d do something inconsiderate like trying a new sex thing without consulting his partner. Jiro’s response also seems in-character to me, since part of what makes her balance out Kaminari in my mind is that she won’t take any of his shit. The strapon stuff is less a real solution to keeping him from shocking her (if he really wanted to, he could send out a shock regardless of if they’re touching), but more about teaching him a lesson.