Denigrate Fifty Shades of Grey all you want. Call it smut; argue that those who read it are “at increased risk of engaging in binge drinking and having multiple sex partners.” Decry it, for as a piece of Twilight fan-fiction that (as a series) spent 100 weeks on the New York Times bestseller list, it’s literal masturbation material being eaten up to a mass audience. Go ahead and say it right now, if you’d like (I’ll probably agree with you). But for all the flack thrown Fifty Shades‘ way, there’s something curiously admirable about it. Not necessarily to do with the movie, but with its marketing: how a few brave souls have been tasked with repackaging cut-and-paste Twilight fan porn into something appropriate for a prime-time TV spot. To that, a new trailer for Fifty Shades dropped last week. It’s steamy, but also weirdly cold and emotionless. It tells us explicitly that this is a movie about people doin’ it with whips and chains, but doesn’t deign to show us much whipping or chaining. On its own, that sounds pretty on the ball for a Fifty Shades movie. But what if we broaden the context? How do other sex movies — that is, films explicitly about sex, with porking as a central plot point — pitch themselves to potential viewers? Well, let’s dig back through the years and find out.