Hi Juss
I am sorry you have homework over your holidays!! I am also from Melbourne and also a bit of a lurker on this site. So we have something in common.
I am aware of an organisation here in Melbourne which works to enhance the lives of Victoria's gay, lesbian, bisexual and transgender communities. I am sure if you e-mail them they would help you with your project. Here is a link to the website.
http://www.also.org.au/index.html
I also think that you are brave to do this topic for your essay. I agree that it is a bit of risk but I think it is unlikely that your fellow students would found out what you did your essay on. But I agree with Krista - I think to cover the bases you should include a bit about sexual prejudice based on gender so that it appears you are covering all angles. But that is up to you - it is your essay after all!!
I hope that helps and that you get your homework done so that you can enjoy your break.
P.S As I said am a lurker but I love these icons - so I may post more!!