heterosexuality

1. 异性的
   A heterosexual relationship is a sexual relationship between a man and a woman.
2. ADJ 异性恋的
   Someone who is heterosexual is sexually attracted to people of the opposite sex.
   1. Heterosexual is also a noun.
      
   2. In Denmark the age of consent is fifteen for both heterosexuals and homosexuals.
      在丹麦，异性恋者和同性恋者允许进行性行为的合法年龄都是15岁。

noun

1. a sexual attraction to (or sexual relations with) persons of the opposite sex

   Synonym:    heterosexualismstraightness