If you think getting something in your urethra would hurt, then you're definitely right about that. It's highly recommended that you first have lots of lube before you even think about trying to masturbate by sounding. But hey, you do your thing and they do theirs. Believe it or not, some guys actually derive pleasure out of stimulating their urethra! If you're an average guy who has yet to try it or more commonly have never thought of putting things inside the tip of your penis for pleasure, then this would surely sound like an insane thing to do. It's just like putting a catheter inside your penis, but not for medical reasons. It's actually the act of putting sturdy rods or similar items inside your urethra. Have you ever tried sounding? No, it doesn't have anything to do with hearing sounds.