Is A Dream of Red Mansions a pornographic book? Why do all the students in my class say "yes"?

Cao Xueqin, the author of A Dream of Red Mansions, is an artistic novel based on the author's family experience. Reflect the darkness of the old arranged marriage with Baodai's love tragedy as the main line. Taking the change process of Jia family from saint to decline as the secondary line, it reveals the decay of feudal nobles. The book "Red" takes the praise of women as its main theme, and describes women of all walks of life and all ages in detail, from the top Jia of feudal system to female actors. Writing about women of any status has a very tragic ending. Thousands of people are crying, and Wan Yan shares the same sadness, seeing the big from the small, and writing about the tragic fate of women in the old society. Through the collusion of Jia, Wang, Xue and Shi, the inside story of the last days of feudalism was told. Taking Jia Wang's fourth surname, Shi Xue, as an example, it implies one of the "family history of blood loss" and warns readers that the great works in the history of literature can be comparable to all the literary values of western Shakespeare's plays.