I think it might be useful for porn-fans to have some standard way of measuring the hardness of a porn scene. Because it's a quick way to know if the hardness of what the lady does in her scene matches the hardness that you want to see for her.
You can read a description of what the lady does in her scene, and know it that way. But it would be a lot faster and more efficient to have a standard rating that tells right away what the lady does and doesn't do in her scene.
1 out of 10: The most softcore porn you can think of is where the lady only shows you a lot of her cleavage. But she doesn't show you her nipples.
2 out of 10: The lady shows you all of her tits, including her nipples.
3 out of 10: The lady takes off all of her clothing and shows you her tits, pussy, and ass. This might also include solo masturbation with or without toys.
4 out of 10: 1 on 1. Pussy only. No ass.
5 out of 10: 2+ on 1. Pussy only. No ass. Can be a pussy only gang-bang.
6 out of 10: 1 on 1. Pussy and ass.
7 out of 10: 2+ on 1. Pussy and ass, with some DP. Can be a no-holes barred gang-bang.
8 out of 10: 2+ on 1. Ass only. No pussy. Can be an all-anal gang-bang, but no DAP or TAP.
9 out of 10: 2+ on 1. Anal and DAP. Should be mostly anal, but can have some pussy during DAP.
10 out of 10: 3+ on 1. Anal, DAP, and TAP. Should be mostly anal, but can have some pussy during DAP and TAP.
Perhaps this rating scheme can be modified. This is just my suggestion. But I think anal plays a big role in how hardcore the porn scene is. More ass and anal is more hardcore.
So, anal isn't just another category of porn. It's a measure of how much the hot lady gets debauched and how hardcore her scene is.