Fashion photography has been about sex ever since Guy Bourdin and Helmut Newton made it that way. Then Tom Ford came along and shaved the Gucci logo into a woman's pubic hair at a campaign shoot; that's when fashion became about pornography, too.
And today, more and more of the industry's top photographers are drawing their inspiration from Internet porn (Terry Richardson is the most obvious example here, but we should also cite American Apparel CEO Dov Charney, who shoots many of the brand's advertising images himself and has helped take the aesthetic mainstream).
So that's where the [extremely NSFW] 'Fashion or Porn' game comes in: Milan-based publication NssMag created a browser game to help you test whether you can tell the difference. Frankly, I'm awful at it. My highest score was 2/40 — granted, the game cuts out if you get a single answer wrong, but I've played at least ten different times. You try.