Stop urinating in between. Do this thrice a day repeating 10 times. The PC muscles control the urine and semen and firmness of your organ during erection, so keeping them strong will increase ejaculatory control. If you are married or having active sexual life with girlfriend then squeeze technique can help you. While having sex when you think you are at the point of coming, ask your partner to gently squeeze the head of your organ. This will help in delaying the urge to ejaculate. A little practice will help get the right pressure. Sometimes it is helpful to masturbate an hour or two before having sex because a second erection afterwards usually lasts longer. Even feeling and touching other parts of the body during sexual act avoiding intercourse can be helpful to remove pressure from your sexual encounters. Simple change in the sexual position which is less stimulating (female up) may also help. Certain medicines eg. SSRI, local anaesthetic cream and condoms are also useful. Viagra increases blood flow to your penis. It can be harmful, if taken without medical advice and supervision. It has no relation with sperm count.