The premise of a United States where premarital sex is outlawed, except for one night a year, offers a promising, if outlandish, foundation for a comedy. However, "One Night Only," directed by Will Gluck, largely squanders this concept, delivering a film that reviewer acknowledges is "surprisingly lame."
The movie, starring Callum Turner and Monica Barbaro, begins with a darkly humorous explainer detailing the new law, which was apparently enacted to promote traditional marriage. Spouses are still permitted to be intimate at any time, but singles face a yearly 24-hour window for consensual sexual activity. The law is enforced via an implant that monitors dopamine levels, alerting law enforcement to illicit activity. The film's setup is described as its "funniest part," blending elements of "The Purge" with a romantic comedy.
Despite the intriguing dystopian setup, the film quickly sheds its novelty. Critics note that the "giggles and ingenuity taper off," leading to a story that resembles a more conventional romantic comedy like "Date Night." The narrative follows Owen (Turner), a pizzeria owner whose girlfriend breaks up with him on this unique night, and Allie (Barbaro), who attends a party seeking a meaningful connection. Their paths cross repeatedly in a series of increasingly "silly situations" as they navigate the mandated 12-hour period.
The review points out several logical inconsistencies in the film's world-building. The speed with which 350 million Americans were subjected to mandatory bioelectronic surgery, in contrast to real-world legislative timelines, is questioned. The practicality of enforcing such a law internationally, given that citizens could presumably travel to other countries, is also raised. Furthermore, the general lack of widespread outrage among the populace regarding the prohibition of a fundamental human function is seen as unrealistic.
The chemistry between Turner and Barbaro is cited as a redeeming quality, with their "flirty and warm" energy providing some appeal. However, their characters are depicted as the least interested in sex among those partaking in the annual event, a point the review finds ironic for a sex comedy. Ultimately, "One Night Only" is characterized as a "routine film" that, despite its bold initial concept, delivers a "fantastic plan at first, but an unsatisfying let-down in the light of day."