Pope Francis has told couples not to have s3x before marriage in a new Vatican guide which explains what the church views as requirements for a successful union.

The leader of the Catholic Church argues in the preface of the new document for priests and dioceses working with engaged couples that ‘chastity teaches the timing and the method of true love’.

He also claims that modern unions ‘fall apart’ quickly and chaste couples are able to learn how to be together without the pressure of s3xual relationships.

This teaching also helps when couples are older, Pope Francis adds, explaining it helps them in s3xless periods late in life and should apply even if engaged couples are living together.

The 97-page document, published on Tuesday, and called the Catechumenal Itineraries for Married Life ‘is a gift and it is a task’, the Catholic Church’s leader said.

This move has not been without controversy, The Telegraph writes, and appears to be in contrast with the Pope’s openness towards divorced and same-s3x couples.

Pope Francis said in the text given the high rates of divorce and fewer marriages in recent years there is a need for ‘renewed pastoral commitment’.

He added ‘at the origin of many difficulties’ that married couples face is ‘the hedonistic mentality that distorts the beauty and depth of human s3xuality’

The document goes on to say: ‘The Church must never fail to dare to propose the precious virtue of chastity, even though this is now in direct contrast with the common mentality.

‘Chastity must be presented as an authentic ‘ally of love’, not as its negation.

‘Chastity teaches married couples the times and ways of true, delicate and generous love, and prepares them for the authentic gift of self to be lived for the whole of their life in marriage,’