I have found over time that I can achieve a sort of multiple orgasm. I will first masturbate as normal until the point of no return. (It does not matter how you do it.) As soon as that moment hits, I stop all touch and let go.
At this point I will cum and have an orgasm, but it will not be as intense. (It is hard to resist not jacking off while cumming, but you must do it)
After this I find that I am able to keep my erection and I do not lose any desire. (I will explain more later)
After the first orgasm, I have found that either I can have another one by jacking off in a few moments or I will not. I do not know why sometimes it is only one orgasm. If I can have another orgasm I can also repeat the hands free method and get yet another one. Repeat the cycle. I have also found that sometimes I cum each time with the orgasms. This could be the left over from the first ejaculation though. Either way, you can maintain an erection for another go around!
If you have ever felt the urge to taste your own cum, you can probably do it with this method and not be grossed out like you get when you cum normally. I find that desire stays.
If you find that it doesn't work, you lose desire and erection, you probably went past the special point of no return, or kept jacking while cumming. There is a fine line that you need to experiment with.
I have had a lot of fun with this method lately, but don't get upset if it doesn't go as planned for you the first time. It takes time and is well worth it!