"Hentai" is a Japanese term that refers to perverted or unconventional ideas, and it has come to be used as a descriptor for adult anime pornography. Hentai content often features exaggerated and fantastical sexual scenarios that are not limited by the constraints of reality, making it a popular genre among fans of adult anime. The subject matter can range from vanilla sex to extreme fetishes and parodies of various franchises. It's important to note that hentai is exclusively for an adult audience due to its explicit nature.