Thanks for the kind words.
My thoughts on ultimatums are overwhelmingly negative. Why would you want to marry someone you have to threaten to go along with it? And why would you want to pressure someone you love into anything (stuff that falls into the tough-medicine category excepted)?
If you want to marry someone, then that must mean you want to spend the rest of your life with him, right? If you've come to that conclusion, then do some more thinking on the topic before you say anything to anyone.
First, are you really at the point in your relationship where that makes sense? Have you seen each other through different things, have you taken note of the way you and he solve problems, are you good for each other, have you outlasted the headrush of initial attraction? If so, then, next step:
Would you be okay with "the rest of your life" remaining as things are? Presumably no.
So, next, what about your status quo do you want to change--do you want to share a home, have kids, make things right in the eyes of God, get your naggy Aunt Mae off your back, secure the legal protections offered by marriage ...?
Then, when you've accounted for what you want next, consider all the possible ways to get what you have. Presumably marriage is one of them, but are there others? Are any of those acceptable to you?
Once you've thoroughly explored all of these ideas, and lined up what you want, believe is best for you and hope is best for him, then you talk to him. You lay out the way you'd like things to be--for example, you want to go through life with him, you want to have children with him--and see whether he shares your vision.
The conversation could end there, of course, but if he does share your vision, then you say that you see marriage as an important step in this process for X or Y reason(s).
Should his plans diverge with yours at any point, you'll have to at least consider what he wants and the reasons he gives. If you think he has a point, then you do things his way. If you don't want what he's offering, then you break up.
100 percent truth, no ultimatums. No fun to start the conversation, but there's no "no fun" like a marriage entered under pressure.
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