Hey Jason X,
You might look at a Google Group, gaybluefilms, while it is mostly gay pornos, they also have gay themed movies. The join link is: Google Groups
and on Yahoo Yahoo! Groups
Among all the porno (some of it rather good BTW) are entries for themed movies listed under: gay themed <title of movie>
Of course, I am not condoning nor advocating the downloading or distribution of copy written material. But should you wish to know a title and get a synopsis of mainstream and independent gay themed movies, you can then NOT click on the download links and instead rent or buy the movies.
Also, MCF Male Celebrities Forum has quite a lot of gay themed entries. The link for MCF is: Male Celebrities :: Index
They usually have a screen cap or two from lots of movies.