City of Women (1980) on Netflix

Marcello is in the compartment of an Italian train, facing forward when the mineral water of the woman seated across from him starts to fall toward him. He catches the bottle and makes eye contact and follows her when she leaves the compartment. For a few moments she finds him attractive too. Then suddenly she gets off the train and starts walking through a field. Marcello follows her, loses her, finds himself in a large hotel surrounded by women. A feminist conference is taking place and he tries to escape.