Most Popular Adult Books of the 2020s

Alien Castaways #2

Wingman

Cara Bristol

Science Fiction · Alien Romance · Adult · Romance

October 6, 2020

Alien Castaways #3

Psy

Cara Bristol

Science Fiction · Alien Romance · Adult · Romance

October 25, 2020

Alien Castaways #1

Chameleon

Cara Bristol

Science Fiction · Alien Romance · Adult · Shapeshifters · Romance

September 16, 2020

Xarc'n Warriors

Pursued by the Hunter

Lynnea Lee

Science Fiction · Alien Romance · Dystopia · Fated Mates · Post-Apocalyptic

January 1, 2020

Possessive Monsters #11

Gamble on a Gargoyle

Maggie Mayhem

Fantasy · Dragons · Gargoyle · HEA Ending · Monster Romance

May 1, 2026

Alien Wolf Tales #5

Alien Song

Honey Phillips

Science Fiction · Alien Romance · Fairy Tale Retellings · Adult · Shapeshifters

January 15, 2026

The Oak and Holly Cycle #1

The Wren in the Holly Library

K.A. Linde

Fantasy · Dystopia · Adult

June 4, 2024

Shadow of the Leviathan #2

A Drop of Corruption

Robert Jackson Bennett

Fantasy · Adult · Mystery

April 1, 2025

The Hurricane Wars #1

The Hurricane Wars

Thea Guanzon

Fantasy · New Adult · Adult · Romance

October 3, 2023

Treasured by the Alien #15

Return of the Alien Warrior

Honey Phillips

Science Fiction · Alien Romance · HEA Ending · Adult · Romance

May 24, 2026

Goldie and the Bear Affair

Liana Valerian

Fantasy · Cozy Fantasy · Erotic Romance · Fairy Tale Retellings · Paranormal Fantasy

April 3, 2026

Monster Mercenary Mates #9

Stalked by the Alien Mercenary

Robin O'Connor

Science Fiction · Alien Romance · Cyborg Romance · HEA Ending · Adult

April 14, 2026

Dragons on Mars #2

Ice Dragon's Heart

Honey Phillips

Science Fiction · Alien Romance · Dragons · Forced Proximity · HEA Ending

July 12, 2026

Dragons on Mars #1

Last Dragon on Mars

Honey Phillips

Science Fiction · Cyborg Romance · Dragons · Adult · Shapeshifters

April 26, 2026

The Sultryverse #1

AcClaim

Jean Thesquare

Adult · Romance

September 18, 2025

Whiteout

R. S. Burnett

Science Fiction · Dystopia · Post-Apocalyptic · Adult · Mystery

February 25, 2025

The Men of Orc Mountain #2

Claimed by the Mountain Man Orc

Pippa Rae Brook

Fantasy · Cozy Fantasy · Fated Mates · Instalove Romance · Monster Romance

October 21, 2025

The Men of Orc Mountain #1

Saved by the Mountain Man Orc

Pippa Rae Brook

Fantasy · Cozy Fantasy · Fated Mates · Instalove Romance · Monster Romance

September 23, 2025

Cyborgs on Mars

The Lone Cyborg

Honey Phillips

Science Fiction · Cyborg Romance · Adult · Romance · Western

September 25, 2025

Galaxy Alien Mail Order Brides #7

Eclipse Bound

Michelle M. Pillow

Science Fiction · Alien Romance · Paranormal Romance · Adult · Romance

September 16, 2025

Dragon Brides #11

Rook

Kate Rudolph

Fantasy · Science Fiction · Alien Romance · Dragons · Fated Mates

September 1, 2025

Vaxxlian Alien Mail Order Brides #9

Balarr

Sue Mercury

Science Fiction · Alien Romance · Paranormal Romance · Adult · Novella

October 20, 2025

The Five Kingdoms #5

The Orc's Captive Bride

Honey Phillips

Fantasy · Orc · Adult · Romance

October 23, 2025

Monsters in the Woods

Spooked in the Woods

Annee Jones

Fantasy · Monster Romance · Adult · Romance

September 10, 2025

Alien Abduction #26

Zinnia and the Zombie

Honey Phillips

Science Fiction · Alien Romance · Adult · Romance

September 4, 2025

Alien Abduction #24

Xara and the Xenobeast

Honey Phillips

Science Fiction · Alien Romance · Adult · Romance

July 3, 2025

Galaxy Gladiators Alien Abduction Romance Series #22

Aries

Alana Khan

Science Fiction · Alien Romance · Slow Burn Romance · Adult · Romance

July 27, 2025

Witches and Shifters: Scott Pack #6

His Whispered Witch

Lucy Piper

Fantasy · Fated Mates · Paranormal Fantasy · Paranormal Romance · Romantasy

July 30, 2025

Historical Ever After #1

Sophia White and Her Seven Promises

Anastasia Hayward

Fairy Tale Retellings · Regency · Adult · Retellings · Historical Fiction

March 1, 2025

Monster Mountain Romance #1

Devilishly Hers

Alana Khan

Fantasy · Fated Mates · Jersey Devil · Monster Romance · Slow Burn Romance

June 29, 2025

The Gargoyle Next Door #3

The Gargoyle in the Cathedral

Alina Riley

Fantasy · Gargoyle · Monster Romance · Paranormal Fantasy · Paranormal Romance

March 2, 2025

Twisted Carnival

Ensnared by the Stone Freak

Vala Stone

Fantasy · Fated Mates · Gargoyle · Paranormal Fantasy · Paranormal Romance

February 28, 2025

Xarc'n Warriors #13

Fated to the Hunter

Lynnea Lee

Science Fiction · Alien Romance · Dystopia · Post-Apocalyptic · Adult

September 25, 2025

The Five Kingdoms #3

The Orc's Bonded Bride

Honey Phillips

Fantasy · Orc · Adult · Romance

April 3, 2025

Season of the Witch #4

The Witch's Spell

Emberly Wyndham

Fantasy · Paranormal Romance · Witches · Adult · Winter Fiction

April 4, 2025

Hot Singles In Your Area

Jordan Shiveley

Horror · Psychological Horror · Adult

February 4, 2024