sb's sex
常用于表格、证件等正式场合，用来填写或询问性别。
Please write your name and sex at the top of the form.
请在表格顶部写上你的姓名和性别。
性行为；性交；社会性别；性别（社会/文化层面）；性欲；性冲动；根据生殖角色将有性繁殖生物划分的类别；这种类别系统,可能因生物或分类分支而异；性交活动
the state of being male or female; the biological category of an organism, or the people in such a category considered together.
指生理性别，常出现在表格或生物语境中。
根据生殖角色将有性繁殖生物划分的类别；这种类别系统,可能因生物或分类分支而异
A category into which sexually-reproducing organisms are divided on the basis of their reproductive roles in their species; the system of such categories, which can differ by organism or by taxonomic branch.
性交活动
activities associated with sexual intercourse
另一种类别,尤其是人类,通常基于性别或性别角色
Another category, especially of humans and especially based on sexuality or gender roles.
性别(男性或女性)
either of the two categories (male or female) into which most organisms are divided
此类类别的成员,集体而言
The members of such a category, taken collectively.
性欲冲动引起的情感
all of the feelings resulting from the urge to gratify sexual impulses
这些类别之间的区别和关系,尤其在人类中；性别
The distinction and relation between these categories, especially in humans; gender.
性活动,通常指性交,除非有修饰词
Sexual activity, usually sexual intercourse unless preceded by a modifier.
Please indicate your sex on the registration form.
请在登记表上注明你的性别。
用法提示：sex在此作名词，表示“性别”。
AI contextual example
The baby's sex was not revealed until birth.
宝宝的性别直到出生时才公布。
用法提示：句中sex为名词，指“性别”。
AI contextual example
The company hires people of both sexes.
这家公司男女都雇用。
用法提示：sexes是sex的复数形式，指“两性”。
AI contextual example
常用于表格、证件等正式场合，用来填写或询问性别。
Please write your name and sex at the top of the form.
请在表格顶部写上你的姓名和性别。
指异性；同类说法还有 the same sex（同性）。
She finds it easier to talk to people of the opposite sex.
她觉得和异性交谈更容易。
sex 可直接放在名词前作定语，如 sex education、sex discrimination。
Sex education is part of the school curriculum.
性教育是学校课程的一部分。
指发生性行为，说法直接，多见于医学、法律或正式叙述。
He had sex with his girlfriend.
他和女朋友发生了性关系。
grammar · medium
易错句子There are two sex in most species: male and female.
正确表达There are two sexes in most species: male and female.
表示“性别类别”时 sex 是可数名词，前面有 two 时必须用复数 sexes。汉语的“性别”没有单复数变化，学习者容易漏掉 -es；同类说法如 people of both sexes（两种性别的人）。
grammar · medium
易错句子They made sex last night.
正确表达They had sex last night.
表示“发生性行为”时，英语固定说 have sex (with sb)，动词不用 make。汉语“做爱”的“做”不能直译成 make；注意 make love 是另一个固定说法，后面不接 sex。
grammar · medium
易错句子She is very sex.
正确表达She is very sexy.
sex 只有名词词性（“性别；性行为”），不能受 very 修饰，也不能作表语；要表达“性感的”必须用形容词 sexy。这是把名词直接当形容词用的典型错误。
发生性关系；做爱
They decided not to have sex until they were married.
他们决定结婚前不发生性关系。
异性
As a teenager, he found it hard to talk to the opposite sex.
十几岁时，他觉得很难和异性交谈。
同性婚姻
Same-sex marriage is now legal in many countries.
同性婚姻如今在许多国家已经合法。
性教育
The school introduced sex education for students aged twelve and over.
学校为十二岁及以上的学生开设了性教育课程。
性别歧视
She sued the company for sex discrimination.
她以性别歧视为由起诉了那家公司。
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性生活
The couple rarely talked about their sex life.
这对夫妻很少谈论他们的性生活。