Grammar Note
作“性行为”义时通常不可数；作“性别类别”义时可数，复数 sexes。
性别；某一性别的人
先理解核心含义，再看它在真实句子里的用法。
性别；某一性别的人
the state of being male or female; the biological category of an organism, or the people in such a category considered together.
Please indicate your sex on the registration form.
请在登记表上注明你的性别。
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
The baby's sex was not revealed until birth.
宝宝的性别直到出生时才公布。
AI contextual example
The company hires people of both sexes.
这家公司男女都雇用。
AI contextual example
they had sex in the back seat
他们在后座发生了性关系
WordNet
the war between the sexes
两性之间的战争
WordNet
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作“性行为”义时通常不可数；作“性别类别”义时可数，复数 sexes。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 4，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.