Sexual intercourse (or coitus or copulation) is principally the insertion and thrusting of the penis .. other racial groups," and that "adults using a condom for intercourse were just as likely to rate the sexual extent positively in terms of arousal.
Characteristics of adult women who abstain from sexual intercourse. Mary Nettleman, MD, MS, Chair of Medicine, Karen S Ingersoll, PhD, Associate Professor.
Am J Epidemiol. Apr 15;(8) Young age at first sexual intercourse and sexually transmitted infections in adolescents and young adults. Kaestle.
Adult Sexual Behavior in Number of Partners,. Frequency of Intercourse and Risk of AIDS. By Tom W. Smith. Summary. Questions on sexual behavior that .