The most sensitive section of the penis is not on the outside, but in! For those ready for it, male sounding explores the depths of the urethra. The tight, nerve-riddled area arouses a LOT of sensations for the wearer, or an exciting game of how low you can go! For BDSM purposes, the dominant may enjoy the complete control they have over their sub while plugging their penis! Try a silicone training set for starters, or a hollow sound for the brave!