Sexual Intercourse, physical sexual activity between human beings that involves the genitals.
For information on: biological purpose, discussion of anatomy, and related matters, see Reproduction; Reproductive System; Gynecology: Infections and Sexually Transmitted Infections; Menopause physiological phases of intercourse, see Human Sexuality consent, see Age of Consent adolescent sexual relations, see Adolescence: Sexual Development illegal and forbidden sexual relations, see Incest; Prostitution; Rape (criminal law) disease transmission, see Sexually Transmitted Infections; Gonorrhea; Pelvic Inflammatory Disease; Acquired Immunodeficiency Syndrome: Modes of Transmission; Herpes: Herpes Simplex; Syphilis; Trichomoniasis prevention of pregnancy, see Birth Control