You get the idea. Multiple, intertwining pairings are known as a Love Dodecahedron (A dodecahedron being a geometric object with twelve faces). The Seven Basic Plots Christopher Booker uses this concept as his definition of the Comedy genre, only the point is that cleaning up romantic loose ends isn't a shoehorn but the soul of the plot: The Villain (or Hero) casts a darkness and confusion across all the relationships until he has a change of heart, which frees up the main couple to get together and that, in turn, frees up everyone else.