I suggest you check out audible. They have a number of gay themed audiobooks there. Most are romance novels.
First, to get the audiobooks category to show up in your iTunes library you simply go to Edit at the top and click Preferences. Under General make sure Show: Audiobooks is checked. Then select all the songs you want to put in audiobooks and right click. Click on Get Info and then click Options. Under the Options tab where it says Media Type change it from Music to Audiobooks. iTunes will automatically switch all selected songs to the Audiobooks category. Good Luck!
Good audiobooks are a great way to get a great story while you're engaged in an activity that doesn't allow you to read. They are even great for people who can't read very well, but still want to enjoy the benefits that a good book can provide. Finding good audiobooks is not necessarily a very easy thing to do. When you're looking over audiobooks, you need to take the time to look over exactly what company produced the book and who is the person narrating it. With this kind of information, you can look up the company online and see reviews on their quality of audiobooks. You can also look up the narrator and see if he or she is the kind of person you'd want to listen to.
audiobooks-free.com
I'm going to have to go with "Astronomy".
You can find free audiobooks on iTunes by going to the "Books" section in the iTunes Store, selecting "Audiobooks," and then looking for the "Top Charts" or "Browse Sections" for free audiobooks. Additionally, websites like Librivox offer free public domain audiobooks that you can download and listen to on your iTunes library.
32-96kbps, gives good quality for audiobooks. Anything beyond that is a waste of space.
Astronomy
Your local public library has audiobooks which you can borrow for free if you have a library card (which you can easily obtain).
You can only download audiobooks for free if the work is out of copyright (e.g. work by Dickens).
Amazon allow two free audiobooks downloads from Audible with 30 days free trial. One can also download audiobooks in the public domain for free from Librivox.
A good place to get some basic information about astronomy would be to get a subscription to Astronomy Magazine. That will have articles and information about the subject.