Measurement of sexual responses Masters & Johnson recorded over 10,000 sexual episodes leading to orgasm in the 1960âs: Volunteers aged 18 to 89 years old. Masturbation, sexual intercourse, oral-genital sex Measurements included heart rate, blood pressure, muscle tension, respiration and brain waives. Penile strain gauges and vaginal photo-plethysmographs measured sexual arousal. King, Human Sexuality Today, 5/e (c) 2005 by Prentice Hall














