She is partially right. Some women wear sexy clothes because they want attention and/or they feel pressured to, so they might wear them, even if they don’t like them.

Some women like the way they look and feel in sexy clothes, so they just wear them for themselves. It’s not necessarily for male (or any other gender’s of interest) attention.

In my experience, the former happens less. I’m not sure if it’s due to the crowd I hang out with changing or a gradual cultural shift.