Oh no my friend, orgasms are not ejaculations. Two different things. It is possible to ejaculate without orgasm. And also possible to orgasm without ejaculation. The latter is recognised by the rhythmical contractions in the BC and PC muscles the first is obvious.
Notice that often just before you orgasm some semen drips out then comes the orgasm with even more semen. I pierced my glans 10 years back. The ring went through the bottom of the glans and out the urethra (called Prince Albert). When the ring moved during sex or masturbation, it stimulated the urethra and made me ejaculate a little while before the orgasm (about 10-15 seconds). When the orgasm occurred I ejaculated once more, not very much this time but it was quite cool.
I managed to achieve this a few times without wearing the ring but it’s not as common. I don’t wear the ring nowadays because it stretches the urethra thus making the ejaculations less forceful. Also wearing the ring during PE is painful.
Yes I mean exactly that, almost come - stop - almost come - stop and again for as long as you like and then shoot. I’m quite sure that doing this will make you experience a light orgasm without ejaculation in due time. These orgasms are not very strong but I’ve heard you can learn to make them stronger and thus become multi-orgasmic. And as I stated before you shoot quite a good load after a real long session. Of course drinking a lot of water during the day will also increase the amount of semen.
Check this link that I found on Male multiple orgasms . They actually mention the semen being caught somewhere just before ejaculation but don’t say anything about larger amounts of semen due to multiple orgasms. That’s my own experience.