A lot of these magazines parodied X-Rated movies (though they're pretty innocuous by today's standards) if they were major studio productions, but they didn't specifically mention the premise of the films. MAD was able to parody “Midnight Cowboy” without saying outright that prostitution involved sexual intercourse.
And this parody of LAST TANGO IN PARIS mentioned the roommate element without mentioning the affair.
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47 minutes ago