Explicit (Adult)

Any image which depicts:

genitals-- pussy, penis, penis sheaths, balls, perineum, and including blatant cameltoes and detailed bulges (penis outline)
genital orifices-- genital slits/vents, cloaca, and anus, including toony x-anuses
sex and/or masturbation
sex toys-- usage irrelevant
cum and/or pussy juice, regardless of context
gore, such as subjects of dismemberment, extreme amounts of blood, physical trauma, and snuff
any content with obvious "extreme" fetish purposes (e.g. heavy BDSM and BDSM toys, hard/fatal vore, scat, watersports, etc...)

Questionable

exposed female breasts with nipples, including obvious depiction of female nipples pulling through clothing slight cameltoes and/or non-detailed bulges realistic blood (without gore or anything else covered under Explicit) pubic hair, perhaps from over the top of underwear or a swimsuit deep/French kissing characters with revealing clothing with obvious erotic or teasing intent suggestive posing (such as butt shot) where focus is drawn to breasts, butt, or covered/obscured genitals all content with slight (but obvious) fetishistic material light teasing bondage (done with household items and similar), soft vore, or depictions of older characters in diapers with otherwise no explicit content are acceptable under Questionable

Safe (General)

    cartoon nudity (see featureless breasts and featureless crotch)
    non-suggestive artwork containing characters in underwear or swimwear
    very mild and/or cartoony blood (such as anime-style nosebleeds, very small/minor cuts, etc)