R rated sci-fi books

5467 books

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

The Burden of Indigo
The Burden of Indigo
Gene O'Neill
R
Titanicus
Titanicus
Dan Abnett
R
Pillaged
Pillaged
Tana Stone
R
The Last Galaxy Game
The Last Galaxy Game
Karl Klyne
R
Almost Gave Up: A Series About Falling Apart & Finding Yourself Again (The Almost Series)
Almost Gave Up: A Series About Falling Apart & Finding Yourself Again (The Almost Series)
Aniya Springer
R
All Systems Go
All Systems Go
J.N. Chaney
R
Blackout Protocol: A Slow-Burn MM Sci-Fi Omegaverse Romance
Blackout Protocol: A Slow-Burn MM Sci-Fi Omegaverse Romance
Rowan Ashford
R
Limitless
Limitless
Alan Glynn
R
Madeleine Is Sleeping
Madeleine Is Sleeping
Sarah Shun-lien Bynum
R
The Queen of Ecuador
The Queen of Ecuador
R. M. Manley
R
The Watchers
The Watchers
A. E. W. Mason
R
At the Rising of the Moon: Irish Stories and Studies
At the Rising of the Moon: Irish Stories and Studies
Frank Mathew
R
Horus Heresy - False Gods
Horus Heresy - False Gods
Graham McNeill
R
The Frightened Fish
The Frightened Fish
Kenneth Robeson
R
Without Warning
Without Warning
John Birmingham
R
The Queen's Shadow
The Queen's Shadow
Adrian Blue
R
Monsoon Fire
Monsoon Fire
T. K. Blackwood
R
Moonfall
Moonfall
Tamara Thorne
R
Masters of Space
Masters of Space
E. E. 'Doc' Smith
R
Morlock Night
Morlock Night
K. W. Jeter
R
The Gathering Storm
The Gathering Storm
William C. Dietz
R
The Shadow Queen
The Shadow Queen
Anne Bishop
R
Shards Of Hope
Shards Of Hope
BL Jones
R
Moon Ahead
Moon Ahead
Leslie Greener
R
Once Humans
Once Humans
Massimo Marino
R
Gulliver of Mars
Gulliver of Mars
Edwin Arnold
R
Ice Age
Ice Age
Brian Freemantle
R
Star Fire
Star Fire
Ingo Swann
R
Sanctuary
Sanctuary
Beverly Barton
R
Shades of Scarlet
Shades of Scarlet
Linda Fallon
R