What about "Leaving"? A middle-aged woman having an affair with a much younger man. ( sorry if it's already been mentioned, I've just skimmed this thread.)
I can really relate to "Julie", especially when she says to her husband: "I'm not your skivvy!" I say that all the time when I feel that that's all I am. I'm sure she represents thousands of middle-aged long-time married women who crave some love, excitement and romance in their life. I know I do!
I said to my husband, who was also watching: "That's what I need, a nice toyboy!" He just grunted!