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
例句
用作名词 (n.)
One part of this relationship is sexual intimacy. 这个关系的一部分是有关性关系的。
They were not having a sexual relationship at the time. 当时他们之间并不存在性关系。
美
