sex [seks]

以下由轻松背单词网站提供

n.性别，男性或女性，性欲；vt.区别…的性别，引起…的性欲

the state of being either male or female

What sex is this fish? 这条鱼是什么性别的？
She does not enjoy the company of the opposite sex. 她不喜欢由异性奉陪。