Sex Is All Relatives (2014)

Xander is shocked to discover that the explicit sexual fantasies written in his stepdaughter's diary, are actually about him. An illicit affair between Nikki and her stepson becomes a source of frustration when her husband's schedule keeps interfering. Aurora's hidden attraction for her step brother reaches a breaking point when he sets out to beat up the guys harassing her at school. After John learns that his stepdaughter's boyfriend is turned on by father/daughter role play, he recommends that the two of them practice together first.

Unfortunately the movie Sex Is All Relatives is not yet available on HBO Max.