May. 23rd, 2018/
Model: Elise Y/
Masters and Johnson met in 1957 when William Masters hired Virginia Johnson as a research assistant to undertake a comprehensive study of human sexuality. According to author Thomas Maier, as part of their clinical research, Masters and Johnson observed paid volunteers engaging in sexual activity while hooked to wires in their lab.
Women’s orgasms have been estimated to last, on average, approximately 20 seconds, and to consist of a series of muscular contractions
Go to the gallery