I buy every new Dennis Cooper book as it appears, have done since the 90s.
Favourites are Try, Guide, Period, My Loose Thread and The Sluts. Period is as creepy as fuck, a ghostly skeleton of a book. Amazing writing in there. I also love the Horror Hospital graphic novel collaboration thing he did.
As for him being a 'typical old queen' in real life, well hell he is a human being not one of the psychos he writes about. Never met him or spoke to him myself but he seems extremely nice about dealing with his fans on his blog.