The frenulum is regarded as one of the most sensitive areas of the penis. It responds particularly well to light, gentle stimulation like tickling, tapping, gliding, or soft rubbing rather than firm pressure. Understanding this spot, is the secret to frotting.
If you're a bator, stumbling into a spontaneous and unplanned JO session with a total stranger is like hitting the jackpot. The afterglow lasts for hours, sometimes for days.