mixing the name isn't as nice of a idea as you might think the kids of the pair now have to deal with a stupidly long last name, for me I have 15 charters then if you chose to mix it again the next generation it become even longer XC .. its fine for the adults but its a pain in the neck for growing kids that cant fit there name on a library card (its fine latter on though) personally i think the last name should be left alone if not changed entirely for the newer generation by the couple. ^^
How would you truly be together forever if you had two separate last names? It's a form of submission for a woman to change her name when she gets married. If she doesn't want her name to change, then she shouldn't get married! Simple as that! I don't know why it's a woman-to-man's-name thing, but that's just how it goes! Men are to protect the women and care for them--who cares if they ARE able to fend for themselves?