We think the fabled mile high club is like the original Woodstock—400,000 people showed up, but if you count everyone who claims to have been there attendance was actually something like 8 million. If you’ve never had sex in the sky, let Paul Rader’s cover for Mike Skinner’s 1962 sleaze novel Flight into Sin inspire you (even if the cover figure hasn’t gotten airborne yet). Skinner is a bit of a mystery, but we know he was credited with other books in a similar vein for Midwood, such as So Wild, The Undoing of Jenny, and The Passionate Virgin, and he seems also to have written Blondes Don’t Give a Damn as Michael Skinner for Kozy Books. As for Rader, there’s little more to add—he was one of the kings of mid-century paperback art. You can read a full bio on him here.