Try "homosexuality movie" without the quotes. The first page of Google results (I only scanned the first page) seems to be the kind of results you want.
Posts: 4 | Location: Rochester, NY USA | Registered: 07-27-04
David, here is an easy way to do it. Go to imdb.com and over on the left there is a search box. Select "plot" from the pull down menu and then in the search box type "homosexuality" or whatever you might be interested in a plot. You'll find movies and tv shows that way.