I tried this one out after hearing it from my little nephew.
Don't jerk for a day or two (if you can handle it!) and drink lots of water. When you're ready to shower, turn it on as hot and leave it until a nice steam builds up. Turn the water to where you're comfortable but not cool or cold, make sure it's still hot in there. Shut the curtain or door, lay back in your shower and start jerking. You will feel like you ran a marathon and you may get a little faint but when you cum it will be the best experience your dick may ever have!!! You'll feel very drained after but it will satisfy you until your next jerkathon.