My masturbation technique requires a vibrating device. I use a men's Gillette M3 electric razor. Just remove the blades from the device and turn it on. Move the device around to find the "sweet spot" on the penis. Don't masturbate in any other way. A good position is to lie on your back. When the orgasm is about to occur, your penis will start to twitch, but you should continue to use the vibrating device rather than your hand. The semen may not squirt out (it may slowly drip out), but the orgasm is usually very pleasurable. It's like someone is torturing you with an orgasm. The feeling may be so strong that you would like to stay in that moment forever. I've also noticed that I ejaculate more semen that way. Now I don't want to masturbate by hand anymore.