*@UsedUpUsername - what I was challenging is the opt cited trope that marriage brings "protection" for women and all the other rubbish on mn. Many women are the poorer partner but many are not and we should not always assume that women are not the higher earners or ones with the most assets.
Marriage does not always benefit women and may not benefit the op.*
This - the picture is very different for an unmarried woman who is a SAHP compared to a professional unmarried woman that earns the same or more than her partner. There are many variations and individual circumstances that have a bearing.
I have seen MANY women hit middle age and be shafted in divorce proceedings when the man hits mid-life crisis and checks out - especially if they are high earners or self-employed and adept at hiding their assets - as these types tend to be (and can pay for expensive accountants/lawyers). Not to mention women who desperately want to divorce but can't afford it.
I have been with my partner for 25 years and we are not married. I earn more than him. He is named on the birth certs of all our kids and has full parental responsibility. Each is named with the kids as benificiary on mutual wills and on all pensions. Property is in joint names. We have a limited company of which we are both shareholders but I have majority.
I don't feel in any way vulnerable and I think it would cost a lot more to untangle all this if either of us wanted to walk away if we were married. Like the OPs partner I had a bit of a philosophical objection to marriage. Now that non-same sex civil partnerships are available we will probably do one of those at some point due to the inheritance tax issue. I feel I am more financially secure and less vulnerable than my married friends, many of whom have little or no income of their own and just have to gamble on whether their husband turns out to be a good guy, or not. I know a few who are trapped in financially abusive marriages where they have to ask for money to get haircuts and squirrel away cashback to buy treats.
I think there is a spectrum of personal circumstances that means that some women may be better off being married, and some may not, or it offers no particular advantage. Either way, it's key for woamne to protect themselves financially I think and no one should be in a situation where they're not on property deeds, don't have wills, and don't have joint and transparent finances.