Corbett v Corbett

Corbett v Corbett (otherwise Ashley) is a 1970 family law divorce case heard between November and December 1969 by the High Court of England and Wales in which Arthur Corbett sought annulment of his marriage to April Ashley. Corbett had known at the time of the wedding that she had been registered male at birth and had undertaken sex-reassignment surgery. However, after the relationship had broken down, Corbett sought to end the marriage, his legal ground for doing so being that the marriage had been invalid, as Ashley was of the male sex and same-sex marriage in the United Kingdom was illegal at the time.

The court held that, for the purposes of marriage, sex was to be legally defined by three factors present at birth that the judge referred to as "biological" – namely chromosomal, gonadal and genital. Any surgery or medical intervention was to be ignored, as were any psychological factors (which were in this case identified with Ashley's "transsexualism").

Holding that Ashley had been born and continued to be a biological male – a fact that could not be changed by surgery – the judge held that the marriage (which had to be between man and woman) should be annulled. Although the judgment was restricted to a consideration of legal sex specifically within marriage, its reasoning was later applied more widely within England and Wales.