R rated sci-fi books

5195 books

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

The Uske
The Uske
Mary Beth Bass
R
Double Blind
Double Blind
Sara Stamey
R
Fireboy
Fireboy
Dean Whitlock
R
Martin and His Friend From Outer Space
Martin and His Friend From Outer Space
Ivo Duka; Helena Kolda
R
Red Mercury
Red Mercury
Mark Fabi
R
Atilus the Gladiator
Atilus the Gladiator
E. C. Tubb
R
Cyberius III
Cyberius III
S. J. Willing
R
The Yoke: A Romance of the Days When the Lord Redeemed the Children of Israel from the Bondage of Egypt
The Yoke: A Romance of the Days When the Lord Redeemed the Children of Israel from the Bondage of Egypt
Elizabeth Miller (I)
R
Journey to Amanah: The Beginning
Journey to Amanah: The Beginning
Colleen K. Snyder
R
Klystar
Klystar
Leong Ying
R
Children of the Land
Children of the Land
B. A. Chepaitis
R
Happiness
Happiness
Frederick Pollack
R
Darktraders
Darktraders
Rosemary Edghill
R
A Rebel's Stone
A Rebel's Stone
PT McHugh
R
Jericho Jones and the Forgotten Fortress
Jericho Jones and the Forgotten Fortress
J. Carlysle Ramsey
R
The Weaving
The Weaving
Gerald Costlow
R
Uncivil Wars
Uncivil Wars
Wendi Kelly; Deborah Dorchak
R
The Warriors Return
The Warriors Return
A. W. G. Coleman
R
The Intergalactic Omniglot
The Intergalactic Omniglot
Jenni Fleetwood
R
The Mystery of Lost Valley
The Mystery of Lost Valley
Manly Wade Wellman
R
Hellflower
Hellflower
Rosemary Edghill
R
Book 2: The World Below
Book 2: The World Below
Kevin Andrew Murphy
R
Bonny Starr and the Riddles of Time
Bonny Starr and the Riddles of Time
Gwen Grant
R
Summer of Love
Summer of Love
Lisa Mason
R
The Call to Shakabaz
The Call to Shakabaz
Amy Wachspress
R
A Killing in Swords
A Killing in Swords
Reginald Bretnor
R
Ethelwina; or, The House of Fitz-Auburne
Ethelwina; or, The House of Fitz-Auburne
T. J. Horsley Curties
R
Outbound Flight
Outbound Flight
Timothy Zahn
R
Hader and the Colonel
Hader and the Colonel
Donna Barr
R
First Rider's Call
First Rider's Call
Kristen Britain
R