Sex Education Links to issues on the human body, religion and sex, the history of sex and illnesses and disabilities and sexuality. (
http://www.bigeye.com/sexeducation
)
This Discovery site summarizes investigative breakthroughs of Masters and Johnson and discusses the four stages of human sexual response. (
http://health.discovery.com/centers/sex/sexpedia/mandj.html
)
This article from Wikimedia gives background of Masters and Johnson and summarizes criticism of their work by another sex researcher. (
http://www.fact-index.com/m/ma/masters_and_johnson.html
)