You can always trust Wayne to wax poetic about a Family having serious sex with other family members. In this story there are reasons behind the Family making love with one another. Firstly the horse ranch upon which they live is literally hours from anywhere. Secondly the three kids are home schooled, and therefore lacking others in their age group. And thirdly there is sadly no adult male around to satisfy Mom, except for her two sons and her daughter. And it means that her sons can easily satisfy that internal itch which constantly needs attention.