Almost all the fiction I read has gay characters. Picking out a book for people, a few variables come to mind:
~How much erotic/sexual content? (Some novels that aren't considered erotica still have a lot of sex.)
~Type of plot? I read a lot of mystery, so I can be more helpful there.
~How much focus on AIDS? Pre-1980s books obviously won't have it, but 1985-95 are likely to have it as a central theme rather than just a fact of life. The mysteries tend not to have much, if anything, about AIDS.
~Pre/post Stonewall? Earlier stories may have a lot of negativity. I just finished one set in the 1940s -- a good story, but a lot of contempt for gays in some characters.
~Some books are easier to read -- more conventional structure and writing. Most of the books I've listed here are the easier sort.
I tend to look for good writing, not necessarily a great plot. IMO, a good author can make most plots worthwhile. I'd make a more specific recommendation if the above factors are known.
Favorite authors - I will probably buy these without knowing anything about the story -- in random order:
Brian Mallory -- young men/coming out issues
Joseph Hansen -- mostly the David Brandsetter Mystery series, but he has a few others.
Lev Raphael -- mystery series; also deals with his home relationship
Anthony Bidulka -- mystery series
Richard Stevenson -- mystery series
Greg Herren -- mystery series (light). He also writes erotica.
Michael Thomas Ford -- less gay focus than others on my list
Larry Duplechan -- semiautobiographical series
Patricia Nell Warren --
The Front Runner and the two sequels
William J. Mann --
Where the Boys Are; others in that series. More sex in these.
Others:
Christopher Bram -- plots vary widely.
Hold Tight was quite good (gay navy man set up in a brothel to help find spies -- WWII).
Fred Hunter -- mystery/adventure series - fun, with much silliness
Others that I enjoyed, but aren't more standard novels for a variety of reasons:
Peter McGehee (heavy AIDS theme; semi-autobiographical, with the second of two books being published by his estate.)
Matthew Rettenmund -- fun, can't explain now.
You can find links to the Goodreads page for these by browsing my book list
https://www.goodreads.com/review/list/5299691-dilo-keith?shelf=#ALL#
I haven't put in ratings or content tags for most, but you'll see whether or not I've read them -- many marked to get or to read. Click on "read" on the left to limit the list.