The "no nudity on characters appearing underage" has been in the TOS for many years.
It was clarified around a year ago and at the same time changed to prevent topless shots of young girls.

The wording and rules were put in place in response to both complaints from members viewing the galleries, and a problem with increasing numbers of inappropriate images of children and/or inappropriate comments on images of children.

Karen

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire