So these seem to be the most popular theories:
1.) Vivienne (ungated, bisexual), Varric (gated - dwarf [and elf?], straight?), Iron Bull (gated - human and qunari [and elf?], bisexual)
* I think this one is unlikely unless Varric is actually bisexual because in this scenario gay dwarves only have one option and I think that it's safe to say that everyone will get at least two options regardless of race/gender/sexuality
2.) Blackwall/Solas (ungated, bisexual), Vivienne (gated - human only?, bisexual), Iron Bull (gated - human and qunari [and elf?], bisexual)
* This one is feasible. It would mean that straight guys get two options (+1 for humans), straight gals get two options (+1 for humans and qunari), gay guys get two options (+1 for humans and qunari) and lesbians get two options (+1 for humans)
3.) Blackwall/Solas (ungated, bisexual), Varric (gated - dwarf and elf, bisexual), Iron Bull (gated - human and qunari, bisexual)
* This is possible, but most people think unlikely because it would be a 5/3 gender breakdown and technically 4 romance options for straight gals and gay guys (with each gender/race/combination getting three choices
Are there any other strong suggestions? I would say that number 2 looks the most equitable and realistic at this point.