This new study is by a researcher who recently received a Ph.D in Economics from Harvard.
It includes graphics showing where the Closet is still common and it raises the question of whether there are actually fewer gay men in the least tolerant states. Click on the map in the article for full information.

See http://www.nytimes.com/2013/12/08/opinion/sunday/how-many-american-men-are-gay.html