James Marsden & Jack Black in The D Train (2015)

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The comedy The D Train centers on married dad Dan Landsman (played by Jack Black). Dan travels to Los Angeles in an attempt to convince his former high school classmate-turned-actor Oliver Lawless (played by James Marsden) to attend their high school reunion. Things get twisted quickly when Dan submits to sex with his high school idol. When Oliver does show up for the reunion and bunks with Dan's family things spin out of control. James Marsden looks fantastic, putting his chest on display in multiple scenes. Jack Black goes even further, getting a rear nude scene. There's also a partial frontal scene as his character sits on a toilet and gets interrupted by Oliver. The two actors also share a kiss.