A Kiss in the Tunnel (1899)

By 1899, early films were developing simple narratives. One of the first tells the story of a stolen kiss. It seems impossible that the filmmakers and audiences of the time were conscious of the sexual symbolism of the train and the tunnel, but that doesn't mean it's not an issue in the film.
This may be one of the very first instances of the use of the basic language of cinema--cuts and editing--to reinforce the sexual inflection of the narrative.