Whether applied earnestly or as a PR gloss for bad behavior, sex addiction is an increasingly common diagnosis. In my view, it's a problematic one. It's ambiguous, hard to define, blurry around the edges, and an excuse for not thinking. If a married man has a lot of extramarital sex, is he necessarily a sex addict? If a seemingly straight man frequents restrooms for casual sex, is he an addict? How much pornography does someone have to look at, how many hours spent in chat rooms, hookers hired, to go from "hound dog" to "sex addict?"