One import general remark about positions is to be able to match the perspective of the scene with reality and align your body to that of the male performer. When this is done well it will feel far more immersive and natural. When it's done badly it's really hard to get a feeling that your in the scene and not watching something on a screen.
I think every position should be checked with something like a quest pro with the passthrough on 50% opacity. Can I match the perspective (align the floor with my room) and still sit, lie down, etc. and match my body to the actor? Can I do this while having my body in a relaxed natural position? Is the size of "my" body correct, are my legs roughly at the same size and is my virtual dick at the right place 🤣?
I still see this going wrong all the time (it might be hard due to males having heads and all 😅) but imo this is the foundation for a good angle. I still often find positions where you cannot match the perspective: without breaking your neck, whithouth looking in the world at a strange angle, without being like a drone hovering just above the head of the male or when you match the floor your body is almost underneath you, etc.
Another thing that you'll often see is that the male body is in the wrong position relative to the origin of the camera. E.g. your body in the scene is to small, your head is not where it should be, the up down angle in relation to your body is unnatural or even impossible.
I think the SLR Originals are doing a pretty good job at this most of the time. But there are also times that it can be improved. Still, doing a "passthrough check" like mentioned in the above is essential imo.
