Looking to get a feminist magazine off the ground, a young woman pitches her idea to a cavalcade of uninterested men. Only one gives her the time of day, and he happens to be a purveyor of porn in the San Fernando Valley. Why not serve up some male nudity along with those serious-minded articles, he suggests? A spoonful of sugar and all that. She hates the idea. Hates it. But having no other options, she agrees. That’s the premise of “Minx” on HBO Max, a snappy workplace dramedy drenched in the sunny glare of early 1970s Southern California. Beefcakes alongside meaty ideas may sound like an un…