You're welcome. That's the key thing. Unfortunately, places that have scenes hardly ever identify the sex position. They may go as far as saying riding, cowgirl, reverse cowgirl, missionary, 69, doggy, spooning, stand and carry and even parts of Kama Sutra and their atttributes. In Kama Sutra, this is an offshoot of the Lotus sex position. Should you find a place (such as xvideos, xhamster, etc.) that lists this sex position. Bookmark it. Keep the links to scenes in a folder. But be forewarned when you come back to them weeks, months and even years later; the scene(s) often times, have been delisted. The scenes being deleted, removed and taken down.
See what comes up here using these sex positions (from your post # 1) in the Niche and Fetish Corner Forum. You may get some links. Later ones work best. Anything older than five years probably won't.
Try putting these sex position names (from your post # 1) into places that sell scenes and videos. Such as clips4sale, adultempire, hotmovies, etc. Try using these sex position names at these places. If the search comes back with a lot of scenes, the next step would be to open an account at these places. Should you find scenes there then purchase them. This way, they become part of your personal account that gets stored. Then you won't run the risk of having a scene being taken down and removed as what could happen at a free tube site, such as xhamster and xvideos and/or at similar places.