Colonel James Granilla, an alien in human disguise, visits the flying saucer of Captain Mother and her all-girl crew in the year 2069. He seeks to learn all about their “intimate ways.” Captain Mother, a sadistic, whip-wielding lesbian, frowns on her gals making it with men.
Wow, it’s even streamable and downloadable on the Web Archive: https://archive.org/details/space-thing-1968