Six iClass levels designating content from child safe to explicit adult that can be found on a listed site. iClass can even be used by parents to determine content restriction measures. And listed sites are required to display the respective iClass banner. (The "i" in iClass represents "internet".)

Before determining the Content Level of your site . . . please make sure it isn't disqualified for one or more of the following reasons...
Sites with chat rooms regardless of the intended audience. (It is strictly about being able to monitor against unacceptable content 24 x 7.)
Any content that requires "legal adult status", including graphical or written forms of explicit sexual acts.
Visual depictions of actual violence during which any severe wounds are inflicted to humans
Visual depictions of actual violence during which any human inflicts wounds upon any living creature
Visual or written content which is in conflict with the listing rules.
Any content globally considered illegal and/or any content deemed illegal in the state of Texas, USA

Content is child safe, but primarily focused towards mature and adult visitors

Content not necessarily intended for or understandable by young children

No nudity

No adult language

No violent content

No adult situations

No age restricted activities presented or depicted (i.e. smoking or drinking)

Content is child safe and can have excellent information for adult use, but its focus is to parents with children ages 3 to 7. (Some commercial sites might apply depending on the product and/or services.)

Primary content intended for young children

Primary content understandable by young children

No violent content

No nudity

No adult language

Content is child safe and can have excellent information for adult use, but is not recommended for children under 8. (Some commercial sites might apply depending on the product and/or services.)

Content not understandable by young children

Content not intended for young children

No nudity

No swear words

May contain drawings and animations depicting mild graphic violence (e.g. online comic books, computer games, and etc.)

Content is not recommended for children under 11 and can have excellent information for adult use . . . including commercial and other sites with information requiring comprehension ability usually associated with individuals 11 and older.

Drawings, paintings, or other artistic depictions of the nude human form

Very mild curse words

Visual and written depictions of animated and real moderate graphic violence (e.g. online comic books, computer games, photos, research material for class work, and etc.)

Not recommended for ages under 13 with parental permission / guidance up to age 15

Drawings, paintings, or other artistic depictions of nude humans in non-graphic erotic situations

Visual erotic depictions with one or more people nude but no genitalia evident

Written erotic descriptions without graphic descriptions of sexual intercourse

Mild curse words

Visual or written descriptions of violence during which death does not occur (e.g. war scenes for class work assignment)

Use of content control through browser or third party software a consideration for younger children

For ages 16 and older with use of content control through browser or third party software a consideration for ages 15 and younger

Drawings, paintings or other artistic media depicting non-graphic sexual intercourse

Full frontal nudity where a state of sexual arousal is not evident

Written erotic descriptions with euphemisms used to describe graphic sexual intercourse

Strong curse words

Visual or written descriptions of staged violence during which death occurs

Sex education material might apply