Learn to do what someone described to me as "reverse kegels". If you relax your crotch area muscles enough (I know, I'm very technical :P ), you can come without ejaculating, and in my experience with doing this, I've been able to remain hard even after orgasm (bonus, this is as close to a male multiple orgasm as you can get).
You can also just masturbate beforehand, which will increase your sexual endurance.
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"Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions." - Albert Einstein
"Wise men talk because they have something to say; fools, because they have to say something." - Plato
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