sexual intercourse
noun(also intercourse)
[uncountable] (formal)the physical activity of sex, usually describing the act of a man putting his penis inside a woman’s vagina synonym coitus性交;交媾 Extra ExamplesShe denied having had sexual intercourse with him. 她否认和他有过性行为。 Rape is committed where sexual intercourse takes place without consent. 未经同意而发生性行为就是强奸。 the crime of obtaining sexual intercourse by threat 通过威胁进行性交的犯罪