A Kiss in the Tunnel - G. A. Smith, 1899

A Kiss in the Tunnel was made in Britain, not the US, but films circulated very widely internationally before the introduction of sound, and especially in the very early years, when French, British, Danish and Italian film-making practices strongly influence Americans. What's notable about this film is that it appears to be the first instance of using edits to give the viewer the sense of seeing into a private, hidden space--a technique that conveys obvious sexual metaphors.