1. God: a human history;Aslan,2018
2. Sex in history;Taylor,1954
3. Three contributions to the theory of sex;Freud,1930
4. https://www.pbs.org/wgbh/americanexperience/features/pill-and-sexual-revolution/.
5. Hills R. Sexual revolution then and now: hook-ups from 1964 to today. Retrieved August 12, 2020, from https://time.com/3611781/sexual-revolution-revisited/; December 2, 2014.