Way back in 1975 the Fall/Winter Sears Catalog, page 602. It showed two male models standing side by side, one of which was in briefs and the other in boxers. It wasn't the briefs that had an inappropriate clothing issue. I remember it was a conversational topic with women then. Even though what looked like a penis poking out was just a publication smudge.
https://groovyhistory.com/the-great-...oversy-of-1975