Those having a marked tendency to disease must not marry those of similar tendency. In some areas of the world, arranged marriage, child marriage, polygamy, and sometimes forced marriage, may be practiced as a cultural tradition. Xxx ] The double standard was also evident in divorce laws of many countries, such as the UK or Australia, which differentiated between female adultery, which was a ground of adultery by itself, and male adultery, which was a ground only under certain circumstances. There are cases of natural blindness, though, to which this rule does not apply. It is often viewed as a contract. Traditionally, the husband was regarded as the head of the household and was expected to be the sole provider or breadwinner, a role that continues in some cultures (sometimes described as paternalistic). When a marriage is performed and carried out by a government institution in
