I typed the comment quickly. I apologise if I offended anyone for the use of the word marriage without considering that many places in the world strictly limit the use of the word marriage to the act of standing in a church with a priest and saying 'I do'.
Per Wikipedia (http://en.wikipedia.org/wiki/Common-law_marriage#United_King...), it seems that the term is common but it does not actually convey legal rights like common law marriage in the US. Of course, since we were discussing use of terms, that fact is of only tangential interest.
Intent and agreement is a big one, not length of cohabitation. The two both must consent and intend on being married and basically tell everyone they are married. Just cohabitation for a long time isn't enough. Nobody can suddenly "find" themselves in a common law marriage they didn't intend or want to enter into, they both must intentionally agree to enter into one.
http://en.wikipedia.org/wiki/Common-law_marriage_in_the_Unit...
I'm not sure what it means to be "philosophically opposed" to marriage in and of itself. I guess it's more self-explanatory in the context of this story though, certainly always in hindsight or with perfect information.
I am really less upset about the people who are asking the question than I may have made it out to sound. It's very important (and would conversely be missed if missing) to have family and friends who are interested, even if they are all asking the same question where it might feel like pressure that we just don't want to have right now.
Surely there must be such an argument, maybe this is too far off topic and not the place for it here.