Others have stumbled across Uncle Joe's collection when helping him pack to move to a retirement community.
Hester Nash, curator of vintage erotica site RetroRaunch, has a theory about what turns us on.
Others hail from more recent decades, up to 1979.
Did those newlyweds take these photos themselves, or were they on a set? The method may also return a negative value if the string exceeds a tweet's maximum length.