Why do we have so many daughters?

This study may suggest why:

Single girls have always grumbled that good-looking men are difficult to find.

But science may have just proved them right – because beautiful women are more likely to have daughters than their plainer counterparts, according to a study.

As parents tend to pass on genes that determine looks, this could result in handsome men becoming rather thin on the ground.

Dr Satoshi Kanazawa, of the London School of Economics, analysed data from a survey of 17,000 babies born in Britain in March 1958 and tracked them throughout their lives.

At the age of seven, their attractiveness was rated by their teachers.

When they reached 45, they were asked about the gender of any children they had.

Those rated as attractive were equally likely to have a son or daughter as their first child – but the unattractive sorts were more likely to have a son.

Put another way, the beautiful women were more likely to

have daughters than those who were less blessed in the looks department, the journal Reproductive Sciences will report.

A previous study of 2,000 Americans suggested that women are becoming more beautiful over the generations because attractive women have more children than plain ones – and a higher proportion of their offspring are girls.

Dr Kanazawa believes that parents tend to produce children who benefit from their own attributes.

Beauty, he says, is of more benefit to a woman than a man, and so it pays for attractive women to have daughters.

But couples blessed with strength and aggression rather than looks are better off having boys, as these characteristics are of more use to males.

It is because my wife is beautiful and I lack strength and aggression.

I just figured i was plain enough looking that i could have tilted the scales towards a boy just a little bit. I guess my wife's attractiveness far outweighs my plain looking-ness.