Although most of these sites now welcome input from the fairer sex (women), these sites have long been a refuge for both, married and single men, alike. Here are the top boards for men's discussion groups, sports talk, etc...
1. FFTodayForums.com (Fantasy Football Today)
2. Boards.Askmen.com
3. ArtofManliness.com
4. NaturallyCurly.com (NC now has a curly men's section on their discussion board)
5. OnlineCliniqurForum.Forumotion.com