When it comes to nude scenes, women don’t have to worry about whether they’re showing attractive equipment when the director shouts “action!” But guys do, of course. In Terry Southern‘s “Blue Movie” a coarse, Joseph E. Levine-like producer named Sid Krassman is persuaded by a Stanley Kubrick-like director named Boris to perform in a sex scene, and Krassman is very worried about not having enough “heft” before filming begins. We’re all familiar with “some show, others grow.” We all want to be horses but male biology has never been especially obliging in that regard.