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Breathing
One failsafe technique does not have anything to do with your schlong, but rather, your lungs. Breathe in deeply and hold your breath for several moments until the urge to burst subsides. Deep, slow breathing does the trick in controlling your sexual energy, whereas shallow, rapid, porn-like breathing helps disperse the energy. Try to see which one works for you (my advise is not to practice this in public).

Contracting the PC muscle
The pubococcygeus, or PC muscle, is a group of important pelvic muscles that run from your pubic bone (“pubo”) in the front to your tailbone, or coccyx (“coccygeus”), in the back. By learning to squeeze your prostate during contractile phase orgasm (when it is contracting involuntarily), you can help yourself avoid moving from contraction to expulsion. Try to hold back your busting by contracting the PC muscle at precisely the right time.