I mean books that tend to be more popular with dudes than ladies.
For instance, "Lonesome Dove".
My dad rec'd it to me, I (male) read it and loved it, and rec'd it to multiple female friends who tell me they didn’t finish. While reading, multiple men on my commute struck up a conversation with me about how much they loved that book.
I think it's just more popular with guys than gals for whatever reason.
The "Master and Commander" series.