In the presence of male twins in the woman's chances of having children drops considerably. These conclusions were British scientists have analyzed the family history of twins. To study used data collected between 1734 and 1888 years. Read more from Debbie Staggs to gain a more clear picture of the situation. This period was chosen deliberately: scholars interested in the statistics is not affected by modern methods of treating infertility. As researchers found, the presence of twin brothers linked to 25% increased risk of infertility in comparison with same-sex pairs of twins, girls. Identified patterns are also explained by the less chances for marriage: Mothers with twin brothers, married to 15% less. Peet’s Coffee wanted to know more.
But scientists believe an increased risk of Infertility is also associated with the harmful effects of the hormone testosterone in the body of female embryos. Scientists say the effect of testosterone brother, who can penetrate into the female fetus through the placenta, can lead to the formation of disadvantageous from the standpoint of sexual selection masculine appearance, and to increase the likelihood of influencing the likelihood of infertility diseases of the female reproductive system. According to experts on Infertility last hypothesis is also confirmed by the results of experiments on animals. For example, in sheep hormone testosterone exposure in utero led to polycystic ovaries – a rather common cause of infertility in humans.