sex

n.

1. 性别; 性
   • What[Which] sex is this fish?
     这条鱼是雌的还是雄的?
   • There are members of both sexes in the team.
     队里男女队员都有。
2. 男性; 女性
   • He never associated with the sex.
     他从不和女性交往。
3. 性关系
4. 性活动, 性行为
   • He did not agree with his mother's views on premarital sex.
     他不同意母亲关于婚前性行为问题的观点。