I understand your reasoning behind that, but Progressive Black Men, Inc was developed to further the reaches of the african-american male. As a member myself, I've seen this organization operate to serve the community at its best. It's true that several of fraternities and sororities resemble this same-sex alienation, but there are a couple reasons for that.
Progressive Black Men, Inc had the intention of fostering educated, goal-oriented black men, who shared the same alturistic view of bettering the community. Everyone knows that there are more black men in jail than there are in higher education, so Progressive Black Men, Inc wanted to distinguish themselves as being a product of men that were going places (which is why PBM is a professional, service organization as it doesn't follow many of the distractions of greek life).
The other thing is despite its name, PBM actually doesn't discriminate on race or gender. So in reality, a woman COULD be in Progressive Black Men, Inc. Will it ever happen...I doubt it.
http://www.hbcunetwork.com/modules/L...veblackmen.cfm