I really think that it’s possible for some men to have them, from my own experience as I uncontrollably tremble and shake my whole body sometimes, and that what many people see as full body orgasms have been skewed, as with many other things, via porn. I almost exclusively watch solo female having real orgasms for porn and you have to wade through so much fake bullshit, it was so popular for several years with cam girls who just spasmed like those fucking flailing tube man things. There are only a few, very few, videos of real orgasms like that and thousands upon thousands of fake “ooh, someone donated X amount so now I magically and immediately have a full body orgasm and spasms around like I’m being tasered”.