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

1. the act of sexual procreation between a man and a woman
    the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur

    Synonym: intercoursesex actcopulationcoituscoitionsexual congresscongresssexual relationrelationcarnal knowledge