Her songwriting has changed a lot from album to album, which can be seen in the graph below. Taylor is more focused on sex in her latest album "Reputation" and less focused on break ups. Notice how she doesn't have any more songs about her "innocence" by album #6.
Meanwhile, her obsession with her public image has grown over the years:
A detailed, in-depth analysis of her song lyrics at the source.
What category would you add to the pie chart, ONTD?