Jim's eyes widened. "Me too," he said. "That's what I was saying: I didn't feel guilty about the sex, but I felt guilty that I hadn't thought about it at all and knew that I was supposed to. I couldn't understand why Spock might be hurt, but I knew it was theoretically possible."

He chuckled.

"Turns out he was even more confused than I was when I told him I'd curbed my natural instincts."