When Christine and I both married our "husbands" it was on the condition that they take our last names. Traditionally, men were the head of the house and the wife took his name. In our cases, our "husbands" were never going to be the head of our homes so it was reasonable for them to take our names. Also, taking our last names reminded them who was actually in charge. Right after we were married, they both changed their last names. Later, they changed them again to legally adopt their female names.