The Oklahoma Anti-Discrimination Act prohibits discrimination in employment “because of sex,” or “based on sex,” which includes, but is not limited to, pregnancy; childbirth or related medical conditions; women affected by pregnancy. As a result, pregnant women must be treated the same for all employment-related purposes as other persons not so affected but similar in their ability or inability to work. The Act applies to employers with 15 or more employees (OK Stat. Tit. 25 Sec. 1101et seq.). A person who is a contractor or subcontractor furnishing material or performing work for the state and agents of that person are also covered by the Act (OK Stat. Tit. 25 Sec. 1301).