Every now and then, we look back at the past and laugh uproariously at our stupid ancestors. Sure, they get a gold star for saving the free world from Nazis, but they also get a negative million stars for giving toddlers cocaine for toothaches. These vintage ads, however, are a specific kind of shameful ... the sexual kind. From what we can tell, 20th century admen were either hopelessly naive or diabolically perverted. Either way, we can laugh at the fruits of their labor.