Quite where American indie cinema can go next, so thoroughly has it been co-opted by the mainstream, is a big question. Writer-director Lynn Shelton offers, at least, a moderately novel solution with Humpday. A bromedy about two friends who set out to make a gay porn movie, it feels at times like a mumblecore take on a Judd Adaptow movie. Although, of course, while Apatow’s films ultimately serve to reinforce the strengths of the masculine dynamic, Shelton seems to set out to dig around in the frailties of the male ego.