Why are men brought to believe by society that 'real women' don't act like stars, strippers etc..?

When it's obvious that they do or else we wouldn't be seeing millions of them out there. Why not just tell men "hey, you want a girl to do this, then give her that." Why try to place a ceiling on men like 'you'll never get a girl to do things like this, this is only fantasy.. only for the movies'..? Where exactly do these girls come from before they get into the movies, stripping etc..? Are men supposed to believe that women don't do these things when our collective observation shows it's absolutely obvious that they do?