The Pregnancy Discrimination Act (PDA) was added in 1978 to Title VII of the U.S. Civil Rights Act of 1964 to prohibit employment discrimination based on a woman’s pregnancy or potential for pregnancy. It did so by expanding the definition of unlawful sexual discrimination (“because of sex”) to include discrimination relating to “pregnancy, childbirth, or related medical conditions.” Under the PDA, any discrimination on the basis of pregnancy is obviously gender specific and is therefore discrimination “because of sex.”