It’s good that I have @roycedaniel nearby. Just puzzled him with a question on what an adolescent boy feels when he ejaculates for the first time: how his penis expands, if his balls shrink or not, what his heartbeat feels like inside his body, the spasms, how many, what about the head and the shaft and the foreskin, and after, what sensations are present. He looked at me puzzled for a good minute.
"I have to get inside a boy’s body,” I said.
Then he gave me the details in abundance.
(If you have anything to say on this matter, please do. But beware, it might end up in my book.)