Other IMDb reviewers have usefully recounted the links of this episode being a remake of "The Case of the Vagabond Virgin" (title of which appears in the opening credits alongside the new title) and the coincidental career ups & downs of beautiful guest star Victoria Vetri. But for me it is the opening sequence that merits comment.
Vetri is picked up on the roadside by the faux-Hugh Hefner character and the black and white visuals and content exactly capture the look, style and risqué situation of countless 1960s Adult movies, only without the nudity and violence that made those pre-rating system releases forbidden fruit shown to Adults-Only audiences at burlesque houses and Adult theatres of the day. Of course, "Perry Mason" would qualify for a G rating once the MPAA ratings were created 3 years later, but the tone is the same. And as with sexploitation films, it would be easy to edit in more explicit insert shots were this episode to have been expanded into a feature film, perhaps for European audiences ("Man from U. N. C. L. E." episodes were famously augmented for theatrical release though hardly "Adult" in content).
I have always contended that mainstream and Adult cinema and TV represent a continuum, as evidenced by the similarity of early 1970s drive-in exploitation movies and subsequent hit TV series (best example: Ted Mikels' "The Doll Squad" begat "Charley's Angels"). The only surprised I had watching "The Case of the Golden Girls" beyond the use of Golden Bear as the club and magazine name in the show without apologies to Jack Nicklaus, was the end credits, attributing the episode to Jesse Hibbs, veteran TV and B-movie helmer. I would have bet anything based on the opening scene that Arthur Marks had been the director, he of hundreds of "Perry Mason" episodes who evolved into a famous drive-in exploitation film director in the '70s ("Bonnie's Kids", "The Roommates", etc.), but I was wrong.