Watch The Last Taboo for Free: How to Stream the Movie Online at 123Movies. . Drawing inspiration from today’s headlines, the story of The Last Taboo revolves around the hot topic of same-sex marriage, and its impact on the lives of four male couples and their friends. Even though it’s evident from the very start of the video that a marriage has taken place, the script is cleverly constructed in such a way as to keep the viewer guessing which couple it is that finally "takes the plunge."