According to Gina Masequesmay, a Professor of Asian American Studies and gender and sexuality, sexism is "prejudice or discrimination based on sex or gender, especially against women and girls. Although its origin is unclear, the term sexism emerged from the “second-wave” feminism of the 1960s through the ’80s and was most likely modeled on the civil rights movement’s term racism (prejudice or discrimination based on race). Sexism can be a belief that one sex is superior to or more valuable than another sex. It imposes limits on what men and boys can and should do and what women and girls can and should do. The concept of sexism was originally formulated to raise consciousness about the oppression of girls and women, although by the early 21st century it had sometimes been expanded to include the oppression of any sex, including men and boys, intersexual people, and transgender people".