Apply strategic pressure. With a little anatomy knowledge, you can delay an oncoming ejaculation by applying pressure to one of two spots.
Perineum pressure: Pressing on the perineum, a spot midway between your scrotum and your anus, will help to stop ejaculation because this spot reaches through to the prostate gland. It is the prostate that contracts and expands during orgasm and then expels the ejaculation fluid. Ask your partner to apply this loving pressure for you.
Testes tug: When a man nears orgasm his scrotum rises up closer to his body. You can delay ejaculation by gently pulling your testes down and away from your body. Your partner can also do this for you.