Kamehasutra 3 -

Wait, maybe they're referring to a book or a modern adaptation? The original text is called Kama Sutra, written in the 4th century by Vatsyayana. There isn't an official Kamasutra 3. Maybe the user is thinking about a modern book or a movie. For example, there was the movie "Kama Sutra: A Tale of Love" from 1996. Maybe they're confused about the title. Alternatively, perhaps they're referring to a continuation or a supplementary text, but I don't think such thing exists in traditional literature.