DLP is an all gay fraternity. Check out the book Out on Fraternity Row by Shane Windmeyer. We went to college together and he's a wonderful gay fraternity man and such an inspiration to others. There are also some great websites you should check out. One is
http://www.lambda10.org It could really help you out. Some fraternities are supportive, and some are not. It just really depends. I would be honest about being gay though, of course if you're honest to yourself then you will. That way...being upfront you'll know whether you'd be accepted or not.