I have a slightly different perspective. Been with DP (boyfriend really) for about a year, all going fantastically well. We live about 10 minutes apart and without fail spend Friday to Sunday together in one of our flats, plus the odd weeknight and going on holiday together. All sin-tastic I hasten to add. We are mid thirties, neither of us has children.
I have a sneaky suspicion that any day now he's going to suggest that we move in together and I really don't want to. Not because I'm not sure about him, quite the opposite - I AM sure about him and I want him to ask me to marry him instead! I had a 5 year relationship in my late 20s, we lived together for 2, didn't end massively traumatically but moving out was a real hassle and I just feel that I have been there, done that.
I feel that current boyfriend should be able to work out perfectly easily from the way we live now to be able to decide whether or not he wants to marry me (though I accept that he may need another year or so to decide to take the plunge) and if he decides that he doesn't, well, at least my living arrangements won't change as a result of the break up.
I am pro marriage, not for moral or religious reasons, just because I would want that level of commitment to feel secure. And I like the idea of life feeling different on a practical level post-wedding. Thing is, if he does suggest moving in I have 2 options (i) say no but don't say why, and he'll think I don't love him enough or (ii) say I am waiting for a proposal, which sounds like I am being impatient and possibly forces the issue when I'd really love for him to make the decision in his own time and have the fun of surprising me.
Bit of a bugger really. For all I know he could be thinking that I would never consider marrying him without living together first....