Samantha Fox and Jack Wrangler are a "modern" urban (NYC) couple in this 1979 production.  They like to do role-playing with each other, such as the opener where "Lucy" enters their apartment and demands $50 from Jack, who gives it to her but wants his money's worth (stripping, tease, b.j., mish, pussy-licking) before it's revealed that she's Samantha.

It's only a small step from there to a swing session with their best friends, Merle Michaels and Eric Edwards, that includes Wrangler plowing Michaels doggie-style and Edwards doing Fox missionarily -- and Wrangler isn't even upset when Fox tells him afterwards that Edwards wants to meet her privately the following afternoon.  In fact, nothing fazes this pair.

But when they try finding fellow swingers through newspaper ads, they get some wild responses, including Vanessa Del Rio and partner who simply want to put on a Shakespearean sex show for the couple.  There's even a mystery when Wrangler is kidnapped from his office and tied up in a dirty stairway as tag-team lesbians Annie Sprinkle and Rikki O'Neal go to work on him, and another when Fox receives a man-sized box with a mysterious note attached.

The point is, some people knew how to make sex comedies in the Old Days, and this one is one of the best.  It'll certainly be on our classic pre-nom list next fall.