Before Prostate cancer, I knew " in theory" that orgasm and ejaculation were separate. I was never able to separate the two.
At 67, I received radioactive seeds, and was told by the doctors that sex was over. This was 2002.
At 84, while watching a gay porn video ( at that time, I thought I was straight), I had an orgasm,and it was great! No fluid but great sensations
Since a gay sex video caused the orgasm, I decided to find a male, and suck his cock. I did, and oral sex was fantastic, though I had no orgasms.
After a while, during oral sex, and him sucking me, I got hard and had my first real orgasm. It created unbelievable sensations in my body from my toes, to scalp!! And it did not stop!! As long as my partner sucked my cock, I orgasmed. The maximum time, I could stand it was 45 seconds. I screamed the house down!! After that, I have had regular orgasms, when with a man, or thru masturbation. The key for me was his concentrating on my glans and peehole with his tongue and lips!!!
Yes, ejaculation and orgasm are two separate acts and the orgasm is the best!!! Good luck!