@Nightweaver20xx
The two highest ratings were slightly adjusted recently (but they were different than those on Derpibooru even before) and now it is like that:
-> visible penis that is not erect or visible vulva and as long as there is not contact with either of them = questionable
-> erect penis but as long as there is no sexual contact or sexual liquids on it and the picture is solo = questionable
-> erect penis when there is more than one character or if there is a sexual contact with genitals = explicit
Details:
→ Exposed genitals (vulva, penis, etc), as long as there is no sexual contact with them.
→ Images where the main focus are the character’s genitals, or images of butts and nothing else.
→ Whenever an image is warrant the specific tag of morbidly obese
→ No depictions of visible sexual arousal between 2 or more characters.
→ Sexual intercourse (sex)
→ Sexual liquids (precum, cum, vaginal secretions) or lubricants in contact with genitals
→ Masturbation or other sexual contact with genitals.
→ Genital insertions
→ Visible sexual arousal between 2 or more characters.