I do think you need to refer to the other thread -
HERE
as some of the context is being lost on this thread. There is an assumption that the partner of the Original OP (OOP from now on) was wanting sex after reading this book when in fact the OOP was concerned that it didn't stop him from having sex.
Many things don't stop me from wanting sex, I can quite happily watch the 10 o'clock news, or some charity extravaganza and not lose my libido - it doesn't mean I'm turned on by it!
Also, the book in question is by Irving Welsh who is renowned for his gritty, hard stories & was enjoyed by many people of both sexes. The implication that it's a "male only" book is totally unfounded!
The OOP didn't like it & couldn't understand how her DP could, and (I think) had opened the thread looking for support of her view & was disgruntled not to get it!
I've not read the book, but it sounds quite interesting so may give it a go based on the "reviews" on the other thread. The main character isn't meant to be "fluffy" & by all accounts gets his comeuppance, he in no way benefits from his actions.
I believe it's perfectly normal to be able to read fiction and not get upset by it. I can only think of a couple of times that I've had to re-read a sentence thinking "did that just happen", never been physically affected by a story & at no time have I (or 99.9% of people) mistaken the story for an instruction manual.
Personally speaking, I think my DW would be more worried if I started reading "feminine" fiction - whatever that actually is...