Yet it’s also impossible to resist a movie that uses “Legally Blonde” as a verb and in which two men adorably bond over Alice Munro short stories. The fairly banal title, which refers to the famously hedonistic New York gay haven, reflects the degree of originality deployed by Andrew Ahn’s “Fire Island.” This, after all, is a rom-com that deploys not one but three genre staples - a party game (here a session of Heads Up!), a karaoke outing (Britney, naturally) and a dance scene - and where every plot development feels preordained.