Ruby, me too, 13 years, 3 dcs. Most of our friends thought we had done it secretly years ago.
The tax issues are slightly worrying (i.e. giving the Government a whole heap of dosh, instead of to my darling children, should my DP die). But I don't believe in being bullied into something I have no interest in. We choose to wake up in the same bed, we don't have to be there. I like that.
If we ever change our minds, shall we go to China and stand in the mahoooosive field and do the big joint moony wedding thing? I don't think so.....