So thanks to user Shulk who gave me a link to the archive with sounds, I myself would not have found it.

My first attempt at adding background sounds like moaning and slipping to a video. For the first experiment, I took the most popular (by likes) video and fiddled with it. Some sounds are too loud, and some on the contrary, but again, this is my first attempt.

The music is specially made a little quieter!