This study examines D. H. Lawrence’s ideas about sex and obscenity in his works, especially Lady Chatterley’s Lover, “A Propos of Lady Chatterley’s Lover” and “Pornography and Obscenity.” Lawrence wrote Lady Chatterley’s Lover in 1928. After publishing this book, he received lots of criticism from all around the world, since he expressed sex relationships frankly and used various kinds of four-letter words in Lady Chatterley’s Lover. Most people thought that it was improper to reveal those secret words in literature. In order to defend his notorious book, Lady Chatterley’s Lover, Lawrence wrote “A Propos of Lady Chatterley’s Lover” and “Pornography and Obscenity” and protested that sex should be saved out of secrecy and that he had used four-letter words to save sex from concealment. Indeed, it is very worthwhile for him to search for a comprehensive understanding of human relationships between man and woman based on real sex, even though most people regarded him as an obscene writer. Furthermore, in Lady Chatterley’s Lover Lawrence tried to find the attainment of wholeness of being through tenderness, compassion, and pity of which most human beings are devoid. So Lady Chatterley’s Lover should be regarded as a wholesome novel, not a pornographic or obscene one.