Cousin Buck(1985)

He brought a new meaning to the phrase "All in the family"!

Cousin Buck is an adult film that follows a mysterious relative's unexpected arrival at a family gathering. What begins as a brief visit transforms into something far more intimate when Buck introduces his hosts to a world of sensual discovery they've never encountered. With charm and expertise, he shares knowledge and experiences that blur the lines between friendship and desire, leaving a lasting impression on everyone he meets. Buck arrives empty-handed but departs having fundamentally changed the dynamics of the household, offering pleasures and connections that go well beyond conventional family bonding.