Not sure about that. These boys seem to have suffered some artistic neutering.
I think there is much more attention paid to drawing "bulges" now than ever before. Certainly, during the days of the Comics Code, the art was checked for anything too suggestive. It's a major reason for the trunks over many super-hero tights... lets the legs muscles show while disguising genital outlines.
It's a constant struggle between the urge to flaunt and the urge to cover up.