This film is a fantasy and just like all of our movies - it isn't reality. It is certainly not advocating that the viewers re-enact anything depicted. The real life performers are not related in any way. They aren't related as steps or otherwise. The sex they are having is a consensual performance that is being acted out solely as a fantasy for the viewers. All performers (and the characters they portray) are at least 18+ years old at the time of the production.