Học những bí mật của tình dục

And that's a shame, because in reality, it is so much more.

One could summarize it as a sexual ethical work of literature about love, life, eroticism, and partnership.

The first chapter is all about the meaning of life.

The second focuses on the pleasures of lovemaking, with kissing, scratching, biting, oral sex, and intercourse.

The third describes mating rituals, courtship, even leading up to marriage.