Hi,
those who read probably know a lot of great links to get reading material. It would be great if you shared these here.
I'll be the first 
I like hXXp://www.literotica.com/stories/stories_by_category.php?category=6&page=1
It has rating, which helps to find good stories, also short descriptions, so you know what to expect.
Another great source is hXXp://eu.nifty.org/nifty/index.html
Unfortunately it lacks the descriptions, ratings, so you have to start reading to see if you want to read the story. Can be a pain in the a** and not in a good way  ;D , but it has a huge collection and while the source above has just a category gay male, nifty has divided gay stories to a few groups. It also has bisexual stories.
Well for me it is the main sources of online stories (I also joined some groups made by authors for their stories).
Where do you read erotic (not only erotic) stories?
Links mentioned in posts bellow
**hXXp://www.asstr.org
hxxp://original.adultfanfiction.net  (hxxp://original.adultfanfiction.net/main.php?list=443)
hxxp://www.livejournal.com/
hxxp://www.fanfiction.net/
hxxp://www.lushstories.com/gay-male.aspx/9
hxxp://storiesonline.net/home.php
hxxp://stories.xnxx.com/
hxxp://www.fantasies.com/categories/9/Gay/
hxxp://stickypen.com/
hxxp://www.menonthenet.com/eroticstories/
hxxp://www.gayauthors.org/stories.php
hxxp://www.sextails.com/sex-stories/publish/gay-erotic-stories.shtml
hxxp://www.adultebookshop.com/erotic_stories.php
hxxp://www.crvboy.org/authors.html
hxxp://www.agaysex.com/gay-stories.html
hxxp://www.asstr.org/~Kristen/gay/index.htm**