The more the couples are having sex, the more boys will be born. The scientists have also found that the number of girls increases with the level of stress in society.
The study of the birth ratio of boys and girls from 1838 to the present day has helped to identify some very interesting features. It turned out that in 1919 and in 1944 there was a sharp increase in the number of boys born. This was due to the approaching end of the two world wars, when people had more time for the simple pleasures of the world, such as sex.
However, there is a theory that the birth of a boy after the world war is explained by evolution. After all, men are more likely to be the victims of these conflicts in the world, so their number has to be quickly replenished. However, modern scholars are more inclined to consider the theory about the frequency of having sex.
In their opinion, the sex of the fetus is determined by the level of hormones in its parents at the time of conception. Boys are more likely to be conceived at the beginning of the cycle. Women’s peak fertility is observed two days before ovulation, but if couples have sex very often, conception occurs even before reaching this peak in the early phase of the cycle.
Of course, women do not have too much intimate pleasure during the war, and if a man comes back to the house, he seeks to fill this gap. The intensity of having sex grows; this is what leads to conceiving a greater number of boys, as experts believe.
Similar statistics showed that the maximum number of girls was born in the most stressful periods of history. For example, after the terrible Japanese earthquake in 1995 or after September 11, 2001 in New York. The researchers found that in times of stress women have a lot of miscarriages of male fetuses. If a lot of sex leads to a baby boy, a smaller amount of sex leads to the birth of a girl. During periods of stress, both women and men are not inclined to having intimate pleasures.