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Classic Sex, page 1

Sexual intercourse, or copulation or coitus, is the insertion and thrusting of a male's penis into a female's vagina for the purposes of sexual pleasure or reproduction. Other forms of penetrative sexual intercourse include anal sex, oral sex, fingering, and use of a strap-on dildo.
Sexual intercourse commonly contributes to human bonding, usually being used solely for pleasure and often leading to stronger emotional bonds, and there are a variety of views concerning what constitutes sexual intercourse or other sexual activity.