Why does anyone look at porn? For tens of millions of American men and women, there’s only one answer: To get more sexually excited. The goal of getting excited, of course, is to enhance the process by which people eventually get not-excited—also called satisfaction. Lather, rinse, repeat three times per week for 75 years. How someone feels about that—deliberately doing something to get more aroused—is an excellent predictor of how they will feel about pornography. For those suspicious of sexual arousal, porn is bad. For those who think that tinkering with our own arousal is selfish or creepy, porn is…