R rated sci-fi books

5467 books

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

On the Shoulders of Giants
On the Shoulders of Giants
Lloyd St. Alcorn
R
Hell on Earth
Hell on Earth
Jake Spencer
R
The Mermaid's Sister
The Mermaid's Sister
Holly Webb
R
Bless the Child
Bless the Child
Cathy Cash Spellman
R
Murder Casts Its Spell
Murder Casts Its Spell
Margaret C. Morse
R
Mastodonia
Mastodonia
Clifford D. Simak
R
Circuit
Circuit
Melinda M. Snodgrass
R
Dead Rat Birthday Cake
Dead Rat Birthday Cake
Brough Girling; Damian Kelleher
R
Back to Before
Back to Before
Jan Slepian
R
Starfarers
Starfarers
Poul Anderson
R
Gom on Windy Mountain
Gom on Windy Mountain
Grace Chetwin
R
California Demon
California Demon
Marilyn Singer
R
The Gnome's Engine
The Gnome's Engine
Teresa Edgerton
R
Escape from the Haunted Museum
Escape from the Haunted Museum
M. T. Coffin
R
Out of the Dark World
Out of the Dark World
Grace Chetwin
R
The Incandescent Ones
The Incandescent Ones
Fred Hoyle; Geoffrey Hoyle
R
Return to the Pleasurezone
Return to the Pleasurezone
Delaney Silver
R
Dark Heart
Dark Heart
Margaret Weis; David Baldwin
R
Paul's World
Paul's World
Mark Shirrefs; John Thomson
R
Angel Eyes
Angel Eyes
Eric Lustbader
R
Falcon's Angel
Falcon's Angel
Judith E. French
R
The Hero King
The Hero King
Rick Shelley
R
Aloha
Aloha
Mark Christensen
R
Side Show
Side Show
Rick Shelley
R
Reel
Reel
Laurence M. Janifer
R
Damnificados
Damnificados
JJ Amaworo Wilson
R
Threshold
Threshold
Janet Morris; Chris Morris
R
Spring Break
Spring Break
Scott Ciencin
R
Time of Her Life
Time of Her Life
Josephine Scott
R
A Choice of Destinies
A Choice of Destinies
Melissa Scott
R