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).
There was a time when heterosexual marriage was taken for granted.
Discuss the legal differences between same-sex marriage and opposite-sex marriage.
Compound of 異性 (いせい, 'opposite sex') and 婚 (こん, 'marriage').