1975 Sears catalog penis
This contribution is strictly anecdotal.
During my junior/senior year of high school, the Sears Penis was a topic greatly enjoyed by many of my classmates. For several weeks, thousands of student-hours were spent in discussion, tracking down copies of the catalogs, etc. I myself was unimpressed; who cares if some male model has a bit of a dangle going on? BUT at the time, all who saw it (even some faculty members!) agreed that it was real male anatomy, not an obscure wardrobe malfunction.