If you like BDSM and penis torture, make sure you are ready to handle things like hot wax being poured on your cock and balls. Dripping candle wax on the most sensitive areas is both painful and erotic. Using this along with bondage will make the area extra sensitive for a more intense experience.
Feeling adventurous? Try urethral play. It involves inserting objects into the urethra through the tip of the penis. There are special tools that should be washed thoroughly beforehand. One of the most popular methods of penis torture is electric shock. This is widely used because you have control over how much of an electric charge you get depending on the tool. A small electric current will give you a tickling sensation. If you turn the power up, you get into painful territory which is popular among particularly sadistic dominants.