How can I prelong an orgasm?

I think that lostandconfused said it just perfect!

One thing I've heard guys doing to prolong is to " take care of business" yourself before you are with her.also think about other things while with her, non sexual things and if you need to, take small breaks during, like pleasing her and increasing the foreplay to her benefit, that way you don't get too excited yourself and she will love you for it

Masturbate before sex, the second cumming takes longer. Include it in your foreplay with the girl, or if you can't get it up and going again quickly enough do it before you are with the girl. At your age you should be able to shoot it twice in less than 10 minutes.

put it in ,pull it out wait a minute repeat

It sounds like you are really asking how to prevent premature ejaculation, although there are ways to prolong your orgasms too.

One thing you can do is masturbate before having sex. The period of time it takes to recover will have slow things down. Also, when you feel like you are getting ready to reach that point of ejaculatory inevitability then stop all stimulation on your penis. You can always do something else for a little bit to let things calm down so to speak.

You an also apply pressure to the perineum before you start to ejaculate.