•What sex is your cat?你的猫是公的还是母的？

•Some tests enable you to find out the sex of your baby before it's born.有些检查能让你在婴儿出生之前知道其性别。

•It's illegal to discriminate against people on the basis of (their) sex.性别歧视是违法的。

•She accused her employer of sex discrimination (= of treating her unfairly because she was a woman).她指控自己的雇主有性别歧视。

•She seems to regard all members of the male sex as inferior.她似乎认为所有的男性都低她一等。

•Members of the opposite sex are not allowed in students' rooms overnight.在学生宿舍不允许异性留宿。

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•Sex before/outside marriage is strongly disapproved of in some cultures.在有些文化中，婚前／婚外性行为是被强烈抵制的。

•She was complaining about all the sex and violence on television.她抱怨电视上充斥着性和暴力画面。

•She'd been having sex with a colleague at work for years.多年来她一直和一位同事保持着性关系。

•Most young people now receive sex education at school.现在大多数年轻人在学校里接受性教育。

•How do you sex fish?你如何辨别鱼的雌雄？

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•How can we sex up science writing?我们如何能把科学写作变得更有趣呢？