Someone was clearly brain damaged by high school. MOST literature contains sex. Certainly nearly all of the good stuff. This is because most humans have sex in their lives. It makes it important in narratives about humans. Joyce's Ulysses includes a guy masturbating in the bushes while perving on a cripple and a vivid description of a rimjob. Gravity's Rainbow is basically a 760 page dick joke. The Sound and the Fury is all about how women's liberation (promiscuity in Faulkner's mind) affected Southern men. McCarthy's Child of God has graphic descriptions of necrophilia. Very few major novels since the 1950s have been vague about sex. Even before then it was almost always there (what did you think the entire conflict of The Sun Also Rises was, or Dorian Gray, or Whitman's poetry?), it just wasn't as explicit or graphic.