In his new memoir, Coreyography, Corey Feldman details the sexual abuse he and fellow child star Corey Haim endured in Hollywood at the hands of men they worked with and considered friends. Due out Oct. 28, the book also describes years of drug abuse both he and Haim faced.

On the 1986 set of "Lucas," Haim told Feldman that “an adult male convinced him that it was perfectly normal for older men and younger boys in the business to have sexual relations, that it was what all the guys do. So they walked off to a secluded area between two trailers ... and Haim allowed himself to be sodomized," Feldman wrote, per an excerpt obtained by Page Six.

After relaying the incident to Feldman, Haim asked, “So, I guess we should play around like that, too?” Feldman dismissed him, saying, that's “not what kids do, man." But Feldman went on to suffer abuse himself, specifically by a man named "Ron," whom his father hired as his assistant. Ron allegedly took advantage of him after turning him onto drugs.

Both Haim and Feldman battled substance abuse issues for years. Feldman, now 42, reached a breaking point when he was arrested for heroin in 1990 at 19 years old. After two more drug arrests, he got sober. Haim was in and out of rehab for addiction 15 times before his death in 2010.

Corey was raped at the age of 11,” Feldman writes, via the New York Daily News, “and like many, many victims, drug use became an easy, if also tragic, way for him to escape the weight of that shame.”

Two years before he died, Haim opened up to People magazine about his demons.

"I was very, very awake and very ashamed of what was going on, how I put it, I was just ... coming into Hollywood, man, [I was] just a horny little kid, like on drugs, getting fed drugs, man, by vampires," he said of being abused at 14. "I still blame myself to an extent, but my conscience is much, much more clear. I have come to terms with this a long time ago but obviously not [totally]. Stuff happens when you are a kid, it scars you inside for life."

In 2011, Feldman told "Nightline" that a "Hollywood mogul" who abused Haim is to blame for the late actor's death. He said pedophilia was and still is Hollywood's biggest problem and darkest secret.