Links from platforms that are know to host sensitive or adult content are automatically placed in a separate "18+" section at the bottom of your profile. (More on organizing your links into sections here)
We do this to protect visitors who may land on a profile page and may not expect adult content, or may not be of legal age.
You can choose to mark any link as "NSFW"; they will then be moved to that section.
However, a link from a known NSFW platform cannot be moved outside of that section.