I don't have specific information on actions taken by the mayor of Ouagadougou to reduce demand for commercial sex acts. However, generally speaking, efforts to address this issue often involve a combination of law enforcement measures, public awareness campaigns, support services for those involved in commercial sex, and community engagement initiatives. These actions aim to tackle the root causes of demand and provide alternatives and support for individuals involved in the industry. If you're looking for detailed or specific actions, it would be best to consult local government reports or news articles for the most accurate and up-to-date information.