These are great insights, Sarah. I trust you'll be publishing a book of your own sometime in the next year or two. You are clearly learning a lot about the psychology of love, sex, and relationships, and you consistently share that learning in well-written blogs.
In light of the miserable track record for marriage as an institution, and especially of the ways it leads to misery for women, we need to be giving deep thought to other structures for commitment and other ways of experiencing sexual connection.