A married woman runs a successful gallery and falls for a man she met accidentally on a train.
The wife meets the guy on a train and accidentally spills coffee on him. They start talking after that every time they ride the train. He visits her gallery and they begin hanging out and dating.
The wife and her lover first kiss at 30:34. They meet and kiss a few times after that and then they have their first sex in a hotel room at 50:20. It is a slow and romantic kind of lovemaking. There's nudity and some thrusting action, but the scene can be quite dark.
The two kiss and play around a bit on the bed at 56:55, with the scene very bright this time. Finally, they have an after-sex dialog scene at 1:12:23, where we see the wife's side boob and naked back.