名词
1. 男性;女性;雌性;雄性
The two sexes are the two groups, male and female, into which people and animals are divided according to the function they have in producing young.
2. 性别;性别特征
The sex of a person or animal is their characteristic of being either male or female.
3. 性行为;性交;性活动
Sex is the physical activity by which people can produce young.
4. 辨别…的性别;辨识…的雌雄
If an animal is sexed, someone finds out whether it is male or female.
5. 发生性关系;做爱
If two people have sex, they perform the act of sex.
相关词组：sex up
1. activities associated with sexual intercourse
e.g. they had sex in the back seat
Synonym: sexual activitysexual practicesex activity
2. the properties that distinguish organisms on the basis of their reproductive roles
e.g. she didn't want to know the sex of the foetus
3. all of the feelings resulting from the urge to gratify sexual impulses
e.g. he wanted a better sex life
the film contained no sex or violence
Synonym: sexual urge
4. either of the two categories (male or female) into which most organisms are divided
e.g. the war between the sexes