What effect are you intending to describe by the adjective?
Brave - of an action with a high degree of risk that is done for a noble/public purpose.
Bold - of an action that is assertive, conspicuous, and challenges an established order/fixed position.
Daring - of an action with a high degree of risk that is done with some bravado and often results in the person doing it being seen positively.
Then I believe "bold" would be best given the meaning I am trying to convey. But then, DonnyB suggested "daring" and also mentioned challenging social conventions. As I understand, both can be used. To be honest, I think I prefer "daring", as "bold movies" apparently refer to Filipino softcore pornography.