N-COUNT 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. (雌、雄、男、女) 性
→ see also opposite sex
N-COUNT The sex of a person or animal is their characteristic of being either male or female. 性别
N-UNCOUNT Sex is the physical activity by which people can produce young. 性行为
PHRASE If two people have sex, they perform the act of sex. 进行性交
sex education 性教育
have sex 性交
opposite sex 异性
sex life n. 性生活
have sex with 与…性交
Sex and death are strange bedfellows.
Sex education is also expected to help check the spread of AIDS.
Mention sex therapy and most people will titter in embarrassment.