She has made it very clear she does not have an interest in wearing a corset.

if she tells you that pictures of men in dirty diapers and baby hats sitting in playpens interests her, are you going to agree?

If you want to keep her in your life, RESPECT her.
Never mind the subtle manipulations or gentle approach. She made it clear in the beginning.

There are many parts to any successful relationship. Communication is one, mutual respect is another.

You like corsets, she doesn't. Accept it.