No beloved TV series would truly make the grade without some sexual tension between its cast members. Though none of the core Friends dated (publicly, at least), a few of the main crew canoodled with guest stars. Before you inevitably ask, no, no one dated Gunther. We’re upset about it, too. VIDEO: Jennifer Aniston on What She Thinks Central Perk Would Look Like Today Scroll down below for a look at five couples who once co-starred on Friends.