Short, concise description of the idea
http://www.livejournal.com/singles/ You know, you have rather a crowd of bisexual and polyamorous LJ users - your options need work :) - catya
Full description of the idea
I'd suggest adding additional options for people looking for someone of either gender, open to multiple relationships, etc.
An ordered list of benefits
An ordered list of problems/issues involved
An organized list, or a few short paragraphs detailing suggestions for implementation