interracial: Porn niche involving partners of different races. Most commonly refers to a black person with a partner of any other race.
amateur: Like in sports, amateur porn features individuals who are not professional porn stars. It features ordinary individuals partaking in every day sexual acts. Girl/boy next door, wives/husbands, girlfriends/boyfriends. Sometimes real amateurs but quite often professional models just pretending.
ebony: This niche is made up of pornographic content involving only black individuals. Sex between a black person and a person of another ethnicity belongs in the interracial niche.