Yeah, I'm familiar with Male Gaze theory. I think Heinlein was indeed pursuing a common assumption by a certain sort of male, namely: "If I were a hot chick, of course I'd have tons of sex with everybody!"

You are right, though, that a large part of Heinlein's appeal was that for all his faults, he was better than many of his peers. At least Heinlein's women got to do things.