Noun. Sexism- discrimination or devaluation based on a person's sex, as in restricted job opportunities; especially, such discrimination directed against women.
Sexism has been, for a long time, a tool used by publicists to promote a product:
Women are shown inferior to the male gender and often reduced to sex objects and as we know... sex sells!
Here are links to interesting articles about sexism in advertising:
Sexism and sexuality in advertising
Sexism sells in the Media
Sexism in product advertising