I can't exactly get behind the conclusions of some of this op-ed, since it's all based on anecdotes and since most polls show a very large majority of young evangelicals opposing most gay issues (the only young religious group who do not are young Catholics), but it's a thoughtful piece and worth skimming through:
http://www.boston.com/news/globe/editorial_opinion/oped/articles/2004/03/13/young_evangelicals_and_g
ay_issues/