There is a twin sister who is difficult to marry

Twin girls with him (or younger brother) often have less desire to marry and have children, because they are "masculine" partially parted from the womb.

A study of Finnish twins showed that if women were born with a brother (or younger brother), the number of women with children decreased by 25%. As for those who have children, the average number of children is also less than 2 compared to women with twin sisters.

In addition, when analyzing data from the 18th and 19th centuries, scientists also found that women with twins (younger brothers) had a marriage rate of less than 15%.

"We found that twin girls with him - his younger brother gave birth less successfully than those with twin sisters," said Lumpia Virpi from Sheffield University in England and colleagues at the University of Turku, Finland, said. "This lack of success includes less ability to marry and less fertility."

Having a twin brother (brother) will make girls less likely to marry. (Photo: Dailymail)

Researchers surmised that it was the result of their exposure to testosterone by their brother (brother) during the nine months in the womb.

Exposure to this male hormone leads to girls having a more masculine tendency in behavior and attitudes, which in turn affects their marriage. In addition, masculine characteristics also make them less attractive in front of men.

T. An