I'm confused.  Why can't 2 adults simply sit down and discuss this?  Woman, "I'm at the age where I want to start a family.  I want you to be the father, and I think we should get married."  The man can respond in the affirmative or negative.  It doesn't take a special day, just one where there aren't a bunch of other distractions.  The issue is she thinks it takes a special occasion.  It just takes an honest discussion.