His father's reaction was so lacking in surprise that Louis actually (a) felt little foolish that he'd been nervous; and (b) wondered if his dad had been assuming he was gay anyway. It probably wouldn't have been that much of a leap, honestly.
"Yes," he said in answer to the first question, though then realized that it didn't actually really answer it, and added, "Um. That it was a man, that people were watching, and, um..." But he let his voice trail off on that point, and then added hurriedly, "And no! I mean, yes. It was. Voluntary. Ca - " Bugger! "He didn't pressure me."