Bawdy and defiantly R-rated but also resoundingly safe and bland, "Sex Tape" gets stuck in neutral early on and fails to recover. Director Jake Kasdan, reuniting with Cameron Diaz (2014's "The Other Woman") and Jason Segel (2011's "The Muppets") following their collaboration on 2011's "Bad Teacher," has trouble finding the right tone. Its raunchy carnality appears virtually chaste, as if Kasdan and screenwriters Kate Angelo (2010's "The Back-Up Plan") and Jason Segel & Nicholas Stoller (2012's "The Five-Year Engagement") are afraid they might offend, while its familial drama is rote and homogenized. There are a handful of solid laughs sprinkled throughout, but the assumption is that bigger and better jokes are yet to come. They never do.
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