coupling season
October-December. The summer fling is over, maybe one last drunken Halloween hookup before it's time to cozy up next to someone else for the winter time, to avoid having to find someone at a bar in the snowy/muddy/rainy weather or having to be once again alone over the holidays just to face your family asking you for the millionth time why you are still single, if you will ever find someone and settle down.
"I don't want to go out, it's raining and cold and I'd much rather stay inside and watch a movie, but I don't want to be alone.." "It's your own damn fault that you didn't put in the effort during coupling season!"