Everything aesthetic has a biological logical explanation:

Hourglass figures like Marilyn Monroe....women with large breasts and narrow waists have higher hormone levels.

Women with higher hormone levels -- esrogen levels -- are more attractive.

In times of scarcity, heavier women are more attractive.

All of those "attractive" elements of beauty are not Maybeline cosmetics or high heels, it's purely biology, wired directly to the sole goal of reproduction. Hourglass figures, estrogen, heaviness ensure, respectively, potential to bear children, potential to successful be infertilized, and, in times of famine, to provide nourishment for reproduction.

Scientific studies have shown high breast to under-breast ratios and low waist to hip ratios reveal higher hormone levels. The beautification of the "Barbie" has some biological grounding.

Pheromones -- those odorless, sightless chemicals can dupe men into being attracted to a moderately attractive women or a woman normally not considered to be attractive. In the sexual tug-of-war, pheromones are the wild card.