Last names

I just made up a theory that holds up in my life. Every girl who is seriously dating someone starts thinking of herself as mrs. Blank just to see how it fits. But for guys, they already have their last name. It's not going to change for them. This suggests that girls don't have their true identity until they are married and given their hopefully final last name. And what of those ppl who remarry, they have to identify the person they are with multiple last names. This concept sucks. It makes ppl think that without this last name that differs from ur maiden name u are incomplete. Hence y marriage is such a big deal in our society. Perhaps this has something to do with divorce rates as well.