Utah, that's which state! Or so says Harvard researcher Ben Edelman, who "analyzed subscriber data from an unnamed 'top 10 seller of online adult entertainment.'" When comparing broadband subscribers, Utah comes in first with an average of 5.47 per 1000. In second place is Alaska with just over 5.03 per 1000, and coming in third is Mississippi.
Before you start giggling about dirty Mormons, however, Edelman notes that "in regions where more people report regularly attending religious services, overall subscription rates are not statistically significantly different from subscriptions elsewhere." (However, churchgoers are less likely to begin their subscriptions on Sunday, which implies that they "shift their consumption of adult entertainment to other days of the week.")
Instead, it looks the higher consumption is actually connected to states "that have enacted conservative legislation on sexuality."
Now that we've veered into political territory, here's a bit of interesting red state/blue state trivia to fuel future accusations in the comments: