Yes, absolutely women only. But we are a wonderful mix of both marrieds and singles. Husbands of our married women are often at our GTGs and welcome to be there.
If you are looking for a singles only forum, (not a dating site) you might enjoy Open Roads Singles at:
http://www.openroadssingles.com/
Click on Forum, and after reading the guidlines click on the link to Join at the bottom.
You will have fun in either group!