The question isn't, why is '70's porn so popular right now as a motif in advertising? The question really is, why did '70's porn ever go away? I submit to you the following two examples, which, if they are not safe for your workplace environment, I suggest you bust out of there like an alien out of John Hurt's stomach.
For Chuck Palahniuk's new book, Snuff: She's a washed-up skin-flic vet with something to prove. And she's gonna prove it with the biggest stunt in adult film history.
For the Diesel XXX worldwide party: This is going to be the best birthday party ever.