To be honest, I don't think that would cut it in most cases - after all, x-rays are internal, while bellies aren't. I mean, none of Diane's scenes for example would really be suiteable to actually accomodate the really big belly, new tits, etc. without changing the position of her torso, legs, MC, etc. and even then those scenes likely just wouldn't be really that sexy because they weren't made for it (I mean, who would fuck a pregnant women while she's basically resting on her belly?). I can understand that he doesn't want to fudge it like that. Edit: Of course it's legitimate to say that he should have planned those scenes right away but I guess that's a moot point for those scenes by now.