MEDICINE: Willibrord Weijmar Schultz, Pek van Andel, and Eduard Mooyaart of Groningen, The Netherlands, and Ida Sabelis of Amsterdam, for their illuminating report, "Magnetic Resonance Imaging of Male and Female Genitals During Coitus and Female Sexual Arousal." [Published in British Medical Journal, vol. 319, 1999, pp 1596-1600.]