Yeeeah. I don't believe him either. Men totally can, as long as they don't ejaculate with the orgasm. I have a playmate who has waaaay more orgasms than I can. It is so hot. Makes him insatiable. So, he holds off on ejaculating, and I hold off on climax (because once I pop I sometimes lose interest) and we go until we sober up or tire out, the he ejaculates, I get off, and we crash hard.
At one point in my life I would have never believed this either! I know now that not all woman are the same when it comes to orgasms. Some can and do cum alot over and over. I also would have never believed in girls squirting either, but was proved wrong on that one as well.
I'm a guy. Before puberty, I experienced toe-curling, multiple dry orgasms. I could just keep going & until I couldn't handle the intensity. I once gave myself 10 dry orgasms in a row without losing my erection. That was so intense, I couldn't walk for 10 minutes afterward! All of that changed after puberty. I lost my ability to just keep going. However, my refractory period is still fairly short. I can be ready to go again in ~10 minutes. If I'm really horny, I can sometimes keep going without losing my erection & experience a second orgasm 10-15 minutes after the first one. My girlfriends have always been surprised (and quite pleased) about that.