Why were menstrual underwear ads deemed "inappropriate"?

New York City's transit authority is taking heat over reluctance to run ads for "period proof" underwear. The minimalist Thinx ads often pair women with symbolic images, like running egg yolks and grapefruits. 

As the controversy continues, Shad checks in with fashion watcher Septembre Anderson. She reflects on the societal discomfort with women's bodily functions and why some images are scrutinized while others are not.