I'm not sure as I haven't read the 'May the Best Man Win' novel. But generally, you can find this information on the book's official website or on the back cover of the book.
It could represent a theme of competition and striving for success within a queer context. Maybe it's about achieving love or a particular goal among gay characters.
That phrase seems a bit confusing. 'May the best man win' is a common expression, but adding'sex comic' to it makes it rather unusual and potentially inappropriate. It's hard to determine the exact nature without more context.
It's likely a comic with some sort of competition theme and maybe some furry-related content. But the specific details would depend on the creator's imagination.