OK, it seems a hint is in order for you cinematic philistines.
Originally a play, my 10-year-old self was very confused at the open-mouth kiss between two traditionally leading-man-type actors that occurred around halfway through the film.
OK, another hint. Although I don't see how anyone who ever saw this film couldn't recognize the outfit (particularly that hat) of the lady in the picture.......
One of the aforementioned open-mouthed-kissing stars later went on to become perhaps the most famous quadriplegic in human history.
Ah. Just out of curiosity, Max.... I've killed lots of brain cells over the years, but I can't recall a scene in Superman in which Christopher Reeves gave another man a full-on mouth kiss.