 In 1962, homosexual behaviour was decriminalised in Czechoslovakia, following a scientific research of Kurt Freund that included phallometry of gay men who appeared to have given up sexual relations with other men and established heterosexual marriages.Freund came to the conclusion that homosexual orientation may not be changed.The claim that phallometry on men was the reason for decriminalization of homosexual behavior in Czechoslovakia is contradicted by the fact that it applied to women as well, as the notion of a male-specific fixity of sexual orientation as an argument for gay rights combined with the notion of female sexual plasticity is adverse to lesbian rights.