South Africa: More Sex During South Africa's World Cup Meant More Boys Nine Months On

analysis

Nine months after South Africa hosted the 2010 football World Cup a disproportionately higher number of male babies were born compared with the previous eight years. There are two reasons for this: people were having more sex and they were happy.

In our study, published in the journal Early Human Development, we found that nine months after the World Cup, the sex ratio at birth increased. The ratio is defined as the proportion of male babies in the total population of babies born.

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