05E04 - The Sexless Innkeeper

Marshall and Lily are excited that Robin and Barney are dating as they now have friends who are a couple with who they can double date. Marshall and Lily don't have such friends because, unknown to them, they, to use Ted's vernacular, suck at being couples friends since they are so intense about making it a good time. Barney and Robin have no idea into what they are entering when they accept Marshall and Lily's invitation to spend a couples night at their place. After what they consider the worst night of their lives on that couples night, Robin and Barney don't have the heart to tell Marshall and Lily. After Robin and Barney eventually dump Marshall and Lily as their double dating friends, they are the ones who end up feeling shunned by the consequences. Meanwhile, Ted is sporting a new look - tweed - to make him look more professorial. He believes it is making him more attractive to the ladies. But when his latest "conquest" leaves the next morning, Barney believes that that look has now put Ted in the role of the sexless innkeeper. Ted tries to prove him wrong.