How can you keep an erection longer?

When you feel like one more stroke will make you ejaculate, stop all stimulation to the penis for a few seconds and then start thrusting or masturbating again. Continue this several times and then when you are ready to ejaculate do not stop and it will be more intense.

If you want to build up your muscles so that you can hold back yourself from ejaculating, find the muscle that stops you from peeing. Act like you are stopping from peeing for 5 seconds and then relax, repeat this 100 times. If you do this daily it will strengthen your muscles so that you can go that one more stroke and hold back your semen. These steps will also increase your squirting distance and the amount of cum ejaculated.