Is it OK?
Well, it's perfectly fine with me, I don't care one way or the other what people do. And I think religion's opinions on the matter are a crock, generally.
I do agree that it's a legal arrangement for the care and maintenance of children, and the distribution of assets, but there are other things to consider:
- health benefits, if your employer doesn't give them to your partner unless you're legally married...
- legal rights to make healthcare decisions in the case that you're unable (would you rather have your live-in boyfriend or girlfriend telling the docs what to do, or your dub family?? Because if you're not legally married, in some cases, the hospital won't even let you visit if the 'legal' family objects)
- legal rights to make funeral arrangements, etc (unpleasant but might be important to you)
- ...there are other things...
All of the above and more are part of the reason the gay community has fought for recognition of their relationships.