It wasn’t a movie I got it from, nor are your assertions PROOF it never happened. ANYTHING in history has a root of truth somewhere. It’s just not always possible to pick out, but to assert that there are no records, so it never happened, is ridiculous. Besides, just how often do you suppose someone’s gonna boast for the record that he had someone else’s bride for the night? Just like slave owners and their female slaves... it HAPPENED but no one talks about it...
Your argument seems to be that if you can’t prove a negative it establishes the positive. This is illogical since it is logically impossible to prove a negative. In any case it is not true that there is no evidence of this practice. In his ‘Histories’ Herodotus claims that an early king of ancient pre-Classical Libya uniquely practiced the right of the first night, and no one else in history had even done it.