R rated sci-fi books

5467 books

Sci-fi books with mature content including explicit sex, graphic violence, or strong language. For adult readers.

Witches on the Road Tonight
Witches on the Road Tonight
Sheri Holman
R
From the Ashes
From the Ashes
Amber Lynn Natusch
R
Supergirl at Super Hero High
Supergirl at Super Hero High
Lisa Yee
R
Alien Battalion
Alien Battalion
Eric S. Brown
R
The Siege
The Siege
Mark Alpert
R
Rebellion
Rebellion
J. A. Souders
R
\"The Day the Angels Cried\"
\"The Day the Angels Cried\"
Samuel James Keith
R
Jericho Jones and the Forgotten Fortress
Jericho Jones and the Forgotten Fortress
J. Carlysle Ramsey
R
Warrior
Warrior
Nick Webb
R
The Terran Gambit
The Terran Gambit
Nick Webb
R
I Have Seen Forever
I Have Seen Forever
Isaac Hooke
R
They Have Wakened Death
They Have Wakened Death
Isaac Hooke
R
Gods Just Want to Have Fun
Gods Just Want to Have Fun
Dylan Perry
R
Nemesis
Nemesis
Anna Banks
R
Martin and His Friend From Outer Space
Martin and His Friend From Outer Space
Ivo Duka; Helena Kolda
R
Shuna and the Lost Tribe
Shuna and the Lost Tribe
John King
R
Misplaced
Misplaced
John Van Stry
R
Bone War
Bone War
Steven Harper
R
Run to Ground
Run to Ground
Jasper Bark
R
The Star Cross
The Star Cross
Raymond L. Weil
R
Bats Out of Hell
Bats Out of Hell
Guy N. Smith
R
dotwav
dotwav
Mike A. Lancaster
R
dotwav
dotwav
Mike Lancaster
R
Necrotech
Necrotech
K. C. Alexander
R
The Descent into the Maelstrom
The Descent into the Maelstrom
Raeden Zen
R
War of Nerves
War of Nerves
Joe Haldeman
R
The Dark Invaders
The Dark Invaders
Raymond L. Weil
R
Wolf in Shadow
Wolf in Shadow
David Gemmell
R
Aliens in the Sky
Aliens in the Sky
Christopher Pike
R
Deadeye Dick
Deadeye Dick
Kurt Vonnegut
R