A lot of marriage is about the economic and legal advantages it provides automatically. Tax status is privileged. Insurance issues are easy. Social Security benefits transfer over. Inheritance rights. Right to make decisions on loved one’s behalf in medical situations. Right to take care of children if spouse dies. These are just the tip of the iceberg. If you want more information, look here. Or check out what wikipedia has to say.
Another part of it is making the public statement before everyone you care about that you want to be with this person. Most people add “until death do we part.” Even if you don’t say that, people seem to expect it if you marry.
I thought I’d never get married. What did I need state approval of my relationships for? And if it were only a marriage license and nothing else, I would have had a private ceremony and never bothered to get a license.
But in the end, I wanted to say, before all my friends and family, and her family that I wanted to make a commitment to her to be with her as long as it made sense (we did not do ”‘til death do you part.’) We did make some other commitments, such as always telling each other the truth, which has been difficult, but we have managed to do, as far as I can tell. We may not have told the truth as soon as we might have, but we’ve done it eventually.
So, if you’re going to write vows, and get up before everyone you care about, and pull together a ceremony, and even, for God’s sake, find a minister just to please your mother-in-law (but he was a minister in a gay church, so nyeh! My grandmother absolutely adored him, and I think she was even trying to put the moves on him, lol.) If you’re going to do all that, then why not get a license? Why not get all the legal privileges that come automatically with marriage?
If you’re thinking that if you’re not married, then it won’t be so difficult to “divorce,” then think again. If you have kids and joint property, then it will be just as difficult, maybe even more difficult, to disentangle everything. At least family law has precedent and rules for the disentanglement. If you have to make it up as you go along, and get involved in civil suits or whatever—well, good luck to you.
Anyway, it seems to me you should have some compelling moral or political reason not to get married. Not getting married even though you have a relationship is a kind of protest. So what are you protesting against? Is it really worth it?