Personally, I don't know why anyone would want to do this... straight women and their boyfriends are an absolute HOOT to watch in gay bars... ;)

http://news.ninemsn.com.au/article.aspx?id=269523

(excerpt)

NineMSN Staff - May 28, 2007

A Melbourne gay bar has been granted an exemption from the Equal Opportunity Act in a landmark ruling which will allow security to refuse entry to heterosexuals.

The owners of Collingwood's Peel Hotel, which came under fire in April for promoting a gay Anzac Day party, successfully argued to the state planning tribunal that banning heterosexuals from the club would prevent "sexually based insults and violence".

http://www.news.com.au/story/0,23599,21804872-2,00.html

http://www.worldnewsaustralia.com.au/region.php?id=137316&region=7

http://www.freerepublic.com/focus/f-news/1840688/posts

http://www.nzherald.co.nz/section/2/story.cfm?c_id=2&objectid=10442247