Do PC muscle exercises. Flexing and strengthening your pubococcygeus (PC) muscle can help you exert more control over ejaculation. (Note that these are also called Kegel exercises, which you might have heard about women doing. The muscle is the same in both sexes.)[3]
Locate your PC muscle. Put one or two fingers right behind your testicles. Pretend that you are urinating, then try to stop the flow with a quick muscle contraction. That muscle you just used to stop the flow from the bladder is your PC muscle.
Flex the muscle regularly. Try to do 10 to 20 squeezes in a set, 2 or 3 times a day. Do a set whenever you're bored or stationary—like when you're sitting at your desk or in traffic. No one will be able to see that you're doing them.
Squeeze your PC muscle when you feel ejaculation coming on. Once the muscle is strong enough, you should be able to hold it off just like stopping flow when urinating.