“异性”常见的英文表达是 “the opposite sex” 或 “people of the opposite sex”，也可用 “members of the other gender”（更强调性别概念）来表达 。
the opposite sex：这是最常用的表达，简洁且直接。例如：Many people enjoy socializing with members of the opposite sex.（很多人喜欢和异性交往。）
people of the opposite sex：意思与“the opposite sex”相近，但表述更完整一些。例如：We should treat people of the opposite sex with respect.（我们应该尊重异性。）
members of the other gender：强调性别差异，比较正式和中性。例如：In the workplace, it's important to create an inclusive environment for members of the other gender.（在工作场所，为另一性别成员创造包容的环境很重要。 ）