# there is a 50% overlap between a man's genital response and his subjective arousal > Put on your sex researcher hat again and imagine conducting an experiment like this:1 A guy comes to the lab. You lead him into a quiet room, sit him down in a comfortable chair, and leave him alone in front of a television. He straps a “strain gauge” (which is exactly what it sounds like) to his penis, puts a tray over his lap, and takes hold of a dial that he can tune up and down to register his arousal (“I feel a little aroused,” “I feel a lot aroused,” etc.). Then he starts watching a variety of porn segments. Some of it is romantic, some is violent, some matches his sexual orientation, some doesn’t. Some of it isn’t even humans, it’s bonobos copulating. He rates his level of arousal on the dial as he watches, and the device on his penis measures his erection. Then you look at the data to see how much of a match there is between how aroused he felt—his “subjective arousal”—and how erect he got—his “genital response.” > > Result: There will be about a 50 percent overlap between his genital response and his subjective arousal. It’s far from a perfect one-to-one correlation, but in behavioral science it’s exciting to find a relationship that strong. It’s highly statistically significant. > [[Come As You Are by Emily Nagoski#^-6rll]]