sexual intercourse

noun

1. 性交；交媾
   the physical activity of sex, usually describing the act of a man putting his penis inside a woman's vagina

1. 性交;性行为;性关系
   Sexual intercourse is the physical act of sex between two people.

noun

1. the act of sexual procreation between a man and a woman

   Synonym:    intercoursesex actcopulationcoituscoitionsexual congresscongresssexual relationrelationcarnal knowledge