Not naive when there's no such thing as "before social constructs"
And we can't say that we know the fantasies of our ancestors. But, we do know that for a very long time we have had gender constructs and fantasies often come out of taboos. So the woman who fantasies about being dominated by a male she cannot attain or the female who fantasises about dominating a male.
I mean to properly answer it would be to look at the psychological and sociological etiology of fantasy.
Aside from all that, you can see how the definition and expression of romance and sexual arousal have changed. Men looked and behaved a lot differently in early cinema and literature - at least in the context of romance and particularly when aimed at women
From GCSE to A level, it's all changing