1. NASCAR
Other important titles: One Track Mind, Hot Pursuit, Slow Burn, In The Groove, The Comeback
2. Cavemen
Other important titles: Prehistoric Pounding, Held Captive By The Cavemen, Island of the Cavemen: The Mating Ritual
*Disclaimer: Most of these are just going to be (self-published) erotica and novellas, but they're still totally readable and hot.
3. Orcs
Other important titles: Servicing the Wargs, Shared by the Orc Tribe, Troll: Taken by the Beast
5. Interspecies hybrids
Other important titles: Blind Date with a Bear, Big Furry Deal, He Ain't Lion, Her Purrfect Match
6. Gargoyles
Other important titles: Between a Rock and a Hard Place, Stone Cold Lover, Underneath the Gargoyle, Hard as Rock
7. Pirates
Other important titles: Pirate's Booty (duh), Adventures on the High Sleaze, Mastered and Commanded, Butt Pirates in Space
8. Centaurs
...and more centaurs
Other important titles: A Centaur Riding Lesson, Broodmaiden for the Centaur, A Well-Centaured Love
9. Demons/Death Incarnate
Other important titles: Succubus Blues, The Devil Inside Me, Oops! A Demon Got Me Pregnant!
10. Medical
Other important titles: Daddy, M.D., What the Doctor Didn't Tell Her, The Surgeon's Special Delivery
11. Amish
...lots of Amish
Other important titles: A Forbidden Rumspringa, The Beekeeper's Son, The Amish Clockmaker, Whoopie Pie Bakers: Volume One
12. Vikings
Other important titles: Lady for the Vikings: Pillaged and Plundered, Pilfered: Taken by the Vikings, Odin's Shadow
13. (E-)Mail-Order Brides
Other important titles: A Bride in the Bargain, A Bride Most Begrudging, Wretched Chastity: The Mail Order Brides of Boot Creek
15. XXXMas
Other important titles: Look What Santa Brought, Cookies and Cream: Santa's Naughty Girl, A Touch of Holiday Spice, The Cowboy's Christmas Cyborg
16. Motorcycle Club
Other important titles: Hell On Wheels, Iron Sinners, Rough to Ride, Stay Vertical
17. Culinary
Other important titles: Love at the Soup Kitchen, All You Can Eat, A Taste of You, On the Kitchen Floor
19. Ghosts
Other important titles: The Ghost On My Couch, The Ghost Inside Me, The Ghost That Haunts My Bum
20. Aliens
Other important titles: Probed: The Abduction, Beastmen of Ator, Close Encounters of a Sexual Kind
21. Knitting clubs
Other important titles: The Sweethearts' Knitting Club, Knitting a Broken Heart Back Together
