I think it's more about body awareness. I also had the idea that anal sex should be associated with pain. I heard bottoms and women commenting that pain was part of the pleasure, but I see that this idea is outdated. Today, sex is seen as something that should be consensual and pleasurable.It was so relieving to know that , i should learn more about this orgasm
And no one needs to be obsessed with having an anal orgasm. Some people have it, others don't, and that's normal. It's like with women: some feel pleasure during anal sex and others don't. There's no set recipe. The important thing is for the person to feel safe and enjoy it.
Today, my understanding of bottoming is that pleasure should be caused by the sensation of a hard penis entering and leaving the anus, stimulating it. There's no need for an anal orgasm; if it happens, that's a plus, but most people don't.