Married couples in the UK produce per unit 6 times as many children then cohabiting couples do.
For example, the 2001 Census recorded over 10 million married couples in England and Wales, with over 7.5 million dependent children; but it also recorded over two million cohabiting couples, with over one and a quarter million children dependent upon them. This was a 67% increase in cohabitation over the previous 10 years and a doubling of the numbers of such households with dependent children. The Government Actuaries Department predicts that the proportion of couples cohabiting will continue to grow, from the present one in six of all couples to one in four by 2031.
Stack v. Dowden - Judgment in Full - Times Online
http://business.timesonline.co.uk/tol/b ... 704361.ece
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