How is Porn rated?

There are many types of Porn which come with different levels of dopamine and levels of violence. When there is a relapse, there is different levels where some didn't provide a lot of dopamine while extreme porn has more. I want a way to distinguish between these types of porn with a scale that I can use to determine how extreme a relapse in comparison to other pieces of Porn. Normally, people use "softcore" to refer to nudity without sex and "hardcore" to refer to sex, violence, BDSM and more.

For this scale, I used grades and determined that 1 is anything innocent and unrelated to sex/porn, 10 is extremely violent, illegal and dangerous Porn and 5 is nudity.

Grade 1-3: Innocent content that can't be sexualised, people may be included but they aren't doing anything that suggests sex.
Grade 4: People in revealing clothes, people in sexual positions but still clothed. This content isn't a porn relapse but implies sex and causes urges to find higher grades of Porn.
Grade 5: Nudity, no sexual acts, softcore porn and is the lowest grade to easily MO to.
Grade 6-7: Anything sexual, varying positions, penetration, This is where Hardcore porn starts but the majority is in the next grades.
Grade 8-9: Anything containing Violence and domination like BDSM.
Grade 10+: Anything Illegal like minors or r*pe and extreme porn is here.

There can also be grades with decimals like Lingerie is 4.8 as it very close to Porn but isn't nudity as no genitalia or breasts are visible.
I'm going to use this to help me consider how badly a relapse is like "I relapsed today to Grade 6 Porn" is more informative (to me) than just saying Porn or suggestive content for Grade 4.

If there is anything I can improve on, I'd appreciate it.