I actually like the idea of Galactus as a force of nature...
As far as Risky Business, I'd say cuz Tom's character was a clean cut upper class kid and the whole thing was played for laffs, so it's easier for the audience to dismiss the situation. But there's lots of movies from the 70's-early 90's that have elements that would be questionable if they came out now ( situations that could be date rape etc)...