Yes, testicles, the scrotum, balls, whatever you want to call them, they are a sensitive lot. Get too rough and the entire mood will be ruined - at least for a minute. But that doesn’t mean you should be scared of them either. Stroke your partner’s balls. Hold them in your hand. Just the act of paying attention to the balls will likely bring your partner to the brink. Watch his reaction and listen to his guidance. He’ll let you know if you can be more firm or if you need to loosen your grip. Start slow and gentle until you’re more comfortable holding him, quite literally, by the balls.