In 1975 Paul and Roz Mellow wrote a bestselling Joy of Sex-type book that mortified their four school-aged children and ultimately changed the shape of the family forever. Thirty years later, as the now dispersed family members argue over whether to reissue the book, we follow the complicated lives of each of the grown children and their conflicts in love, work, marriage, parenting, and, of course, sex -- all shadowed by the indelible specter of their highly sexualized parents.