Probably in the mid-2010s, I saw a video on YouTube that I remember as being a compilation of claymation scenes that were not intended for children. My guess is that the claymation was made in the 1990s or in the early 2000s, and I think that it was probably all made by the same person/people.
The only part that I can remember in meaningful detail was a brief scene that showed two faces kissing each other normally at first, then the faces would become distorted when they kissed each other, and after the last time the faces kissed, the faces transformed into a crude depiction of genitals in heterosexual intercourse.
I remember that the clay had a very limited colour palette; I think that everything or almost everything was just a clay-red colour. The claymation looked like it was made by someone who had experience with the art form, but I have a feeling that the claymation in the video was intended for use in some kind of art event, and not as part of a film. I remember that the only audio for the whole video was generic-sounding upbeat piano music that was playing over the video; this was probably just stock music.
I'm pretty confident that the video was not something that was made by Lee Hardcastle; the video looked too old for that, the claymation was not colourful, and I doubt that the video contained any pop culture references.
I also don't think that the video was made by Aardman; I have already seen some early videos that were made by Aardman and I'm aware that some of them were not for kids, but I haven't seen anything from them that was similar to the video that I am describing here. The video didn't look like the work of Will Vinton Studios, either.
If anyone here might know what video I am talking about, I would be interested in knowing what its title is and what the background of the video is.
it sounds like it could have been Dialog Vášnivý by Jan Svankmajer. starts at around five minutes into this video
Thank you for the suggestion, but I think that the claymation video that I saw used human heads that were less realistic than that, and I think that the background was black throughout the video.