Quote by OliviaDitto!
You could try jerking off ahead of your sexual experience. Men will come quickly the first time, but should have delayed ejaculation with each subsequent orgasm. Don't limit your sex play to one orgasm. It's fun to enjoy oral and climax there and then pleasure her or use more foreplay until you're hard again and ready for the second round.
You could also try using a cockring - a common device used to delay ejaculation.
Here are some other techniques:
Start & Stop Technique
The primary principle of this technique is to stimulate the penis until near ejaculation, and then to stop stimulating to allow the level of excitement to drop. This exercise can be performed alone, or with a partner, and should be repeated 3 to 5 times per session. After 2-6 weeks of using this technique you should notice an improvement in your sexual stamina and will eventually not even have to use it to outlast your partner.
Squeeze Technique
Right before you feel you are about to ejaculate, approximately three or four strokes away, stop stimulating and squeeze the base of your penis by wrapping your thumb and index finger around it. Apply firm pressure, focusing on the urethra, the tube running along the underside of the penis. This lessens the tension and holds back the ejaculatory response. Be sure to apply pressure a few strokes before ejaculating, if you wait too long, it may be too late! You should be able to apply this technique anywhere along the shaft of the penis, as long as it squeezes the urethra.
Regular Masturbation
A great method for boosting sexual stamina and releasing sexual tension is regular masturbation. By masturbating more often, you can train yourself to become more used to the stimulation. As you get more and more used to it, it should start taking you progressively longer to climax.
Wearing Condoms
Many couples have claimed that wearing condoms significantly reduces the stimulation of intercourse for both partners, but especially the male. If you are not already using condoms to protect against STD's and pregnancy, try wearing them to increase your stamina.
Sex Toys
Following the same line of logic as in "Regular Masturbation" above, you can use sex toys to help you become more "immune" to the pleasure. Sex simulators are recommended over regular vibrators, but both should work.
Quote by sexyfun77
You should definitely cum before sex. Makes the build up period longer and more enjoyable for longer sex with ur partner.