This is not a "weird relationship" thing, rather women got organized and: https://en.wikipedia.org/wiki/Breast_cancer_awareness
It’s more broad than that, it’s the relationship with women’s health as a whole.
If you're really interested, watch some older Dutch movies to see the normalness of naked, like Turkish Delight [0]. Or even have a closer look at the relation between the Professor and Raquel in the recent Casa the Papel. It's different from US series. More respectful, mature wrt women if you ask me. More emphasis on intelligence. Or on a beautiful woman in her 40s with normal wrinkles. The US, like on many other topics, seems to be polarized, caught between the hyper sexuality of Cardi B and the prude nature of American culture in general.
[0]: https://en.wikipedia.org/wiki/Turkish_Delight_(1973_film)
Fixed that for you.