There is
Night Warning-82' aka: Butcher, Baker, Nightmare Maker
, with Susan Tyrell and Jimmy McNichol which is a goody. It has a homophobic cop and aunt, a gay gym teacher and a pretty boy male lead to which the film alludes to him being gay. Although it cops out a bit, that was just the era.
Don't eat the whole ones! Those are for the guests.

I liked Cruising. Pretty out there for its time

Thanks for the suggestions. Gonna have to check them out

Cruising is prob the greatest.
Urbania isnt too bad.

Some of these might be more in the thriller genre:
Basic Instinct (1992)
Cruising (1980)
Frisk (1995)
A Nightmare on Elm Street Part 2: Freddy's Revenge (1985)
The Silence of the Lambs (1991)
Edit:
Dahmer (2002)

Ticked Off Trannies with Knives (2010)
It's bloody awful.
Boredom is bullsh#t.

Haute tension (2003)
I suspect you've already checked this out though.
Jeepers Creepers II (2003)

• Gay undertone
  Hard (1998)
• More detective thriller than slasher but was pretty good.
  There aren't really many GOOD gay slasher flicks, so the following are just what I saw.
  The Gay Bed and Breakfast of Terror (2007)
• Silly comedy-horror
  Dead Boyz Don't Scream (2006)
• Very amateurish, bad acting but the final twist was good.
  Sculpture (2009)
• This isn't exactly a gay slasher and very bad, but if you like hot hunks, maybe worth a try.
  And I enjoyed Hellbent too.
  Never throw away a chance for happiness too quicklyit can get to be a habit.

For what it's worth
Hellbent (2004)
is probably the only true "slasher" style movie I can think of. Whilst zombies and post apocolypse are my first choice, I also love it if people die in movies. Yeah, I can't explain it either but, with LGBT movies, that only goes for anything that's NOT a death related to a hate crime. Not very fond of watching those.
The Gay Bed and Breakfast of Terror (2007)
The title says it all.
9 Dead Gay Guys (2002)
It's a comedy/crime movie but I love it cause I laughed so much.
The War Boys (2009)
Stars a young Brian J Smith woot! I think he dies at the end.
I'm sure there's a few more I can't think of at the moment. I'll post them if/when I remember if you're still interested.
That's my 2 cents and no, you can't have it!

The only one I can really think of is Hellbent, though its not very good.