Adult Actors Edit
Actors and actresses are automatically marked as adult when more than 10% of movie credits are set as "adult". Unless you have your account "Include Adult Items in Search?" setting enabled, they will not appear in search. You can change this setting in your account settings.
These credits are used for anyone involved in the porn industry (filmmakers, directors of photography, editors).
Please consult the FAQ to learn how to fix profiles wrongly marked as adult.