性別正式的英文是Sex。sex英式發音[seks]，美式發音[s?ks] ?，意思是：性別，兩性之壹，性，性特征，性活動。
Sex
1、She continually failed to gain promotion because of her sex?
她因為是女性而遲遲得不到晉升。
2、He was very open in his attitudes about sex?
他對待性的態度非常開放。
3、The birds must be weighed, sexed and tagged.?
必須對這些鳥稱重，辨識雌雄並掛上標牌。
4、The new technique has been used to identify the sex of foetuses.?
這壹新技術已經被用來鑒別胎兒的性別。
5、The entire film revolves around drugs, sex and violence?
整個影片圍繞著毒品、性和暴力展開。
6、We have a very active sex life.?
我們的性生活非常活躍。
7、We have been able to divorce sex from reproduction.?
我們已經能夠將性和生育完全分開了。
8、My sex life is my business?
我的性生活是我自己的事。