The traditional marriage vows made by couples on their wedding day contain a promise to stay together "until death us do part."

But a proposed change in the law in Mexico could make that a slightly less binding 'two years' time'. The idea is to cut the divorce rate by creating renewable marriage contracts so lovers can try living with their other half before making a lifetime commitment.

Newlyweds would take a minimum of two years before deciding whether to cement their relationship or split up, under plans to alter the city's civil code.

If it becomes law, the contracts would make clear in advance the responsibility for marital duties, such as childcare, schooling and household budgeting.

Half of all marriages in Mexico City currently end in a break-up. The author of the proposal hopes that being able to renew or dissolve the marital link after a fixed period of time will lead to more harmonious relationships and keep more couples out of the divorce courts.