Each material has its own author and owner, who we are not.
So we use the same rule used by most social media sites, including Instagram and Facebook: female nipples or genitalia mean adult material.
To verify send an original photo of yourself showing enough of your body to match with your other photos face and nudity not required if the pics you post don't show them , holding a handwritten paper that includes your username, the subreddit name and the current date.
If you posted verification to another subreddit, send the link and we may use it as verification here.