Suggestions:
asian: Porn involving oriental women or men.
thai: This niche involves individuals from Thailand either posing or engaged in sexual activity.
chinese: This niche involves individuals of Chinese descent either posing or engaged in sexual activity.
japanese: A video category that focus on japanese performers.
ladyboy: Young and often very feminine transexual. The term "ladyboy" often reference an asian (from thailand) young feminine boy or transexual. See also "kathoey".