noun
heterosexual marriage; opposite-sex marriage
Refers to marriage between a man and a woman, often used in contrast with 同性婚 (same-sex marriage).
異性婚が当たり前だと思われていた時代もあった。
There was a time when heterosexual marriage was taken for granted.
同性婚と異性婚の法的な違いについて議論する。
Discuss the legal differences between same-sex marriage and opposite-sex marriage.