In "Friends with Benefits" (2011), Justin Timberlake and Mila Kunis, above, played "millennials who, clueless about how to maintain romantic relationships, agree to engage in casual sex," writes Kira Davis. (Sony Screen Gems)

In "Friends with Benefits" (2011), Justin Timberlake and Mila Kunis, above, played "millennials who, clueless about how to maintain romantic relationships, agree to engage in casual sex," writes Kira Davis. (Sony Screen Gems)