Mm. I feel you're borrowing trouble. It doesn't matter if the guy doesn't recognize his arrousal response as arrousal. That's what it is. There's a certain amount of removing subjectivity necessary for conversation, and while I know you feel the lack of utter, complete objectivity is bad, that doesn't mean everything is subjective forever. There's a middle ground. Coming to the understanding necessary to communicate isn't that bad. It's not different than recognizing Chinese and English as separate languages. Maybe you need to calibrate per group, sure. But that isn't a problem. It's possible to have different calibrations per group just like it's possible to switch from Chinese to English based on target audience.