Horror is the first that comes to mind. A little bit creepy or spooky is fine, but out and out horror is a non-starter for me. I have vivid mental images of books I read decades ago that seared themselves into my brain and still have the power to make me shudder. Then there are the nightmares…
Erotica is another genre I’m not fussed about. Now don’t misunderstand, I love me some heavy-duty grappling in a book, so authors can toss in as much or as little sex as they like, on condition that it fits into the story, and the plot isn’t just flimsy scaffolding to hang all that industrial-strength humping on. If the characters are constantly either doing it or thinking about doing it, that’s too much. I loved Erica Dakin’s Theft and Sorcery series, for instance, which features some seriously horny half-elves, but there’s a cracking fantasy plot behind all the bonking.
Then there are thrillers. If there’s a gun on the cover, it’s a safe bet I’m not going to enjoy it. I suppose military sci-fi comes into the same category – lots of fighting, explosions, shoot-outs. Give me characters first and foremost, and don’t overwhelm me with action that features an explosion on every other page.
Footnote: Authors Answer is the brainchild of blogger Jay Dee Archer, of I Read Encyclopedias For Fun. You can read the answers to this question by his eclectic bunch of authors here. More recently, Erica Dakin, of the Theft And Sorcery blog, has been answering the questions independently. You can read her answer to this question here.