Women in the age of puberty was much earlier than ever before. In the U.S., for example, a recent study, more than 10 percent of women breast growth in the country at the age of 7 years.
According to "Psychological Science, Association for Psychological research published in the journal Science, the women who are physically growing up earlier, have a tendency to get out early, had sex at a younger age, and sex partners of women in most of its time.
So their chances of contracting sexually transmitted diseases is very high, so the possibility of giving birth in their teens.
Jay Belsky demand Birkbeck University of London, England, to assess this news may be bad for some people, but that really was the phenomenon is natural and reasonable from the perspective of biological evolution.
This leads to expectations sekaranga man who grew up in a potentially unstable, accelerated aging (puberty), thus increasing the chances of someone reproduce before dying.
The relationship between risk, unstable environment which is reflected in the bond of mother and child are not safe (not love), and precocious puberty, Belsky and colleagues used data from 373 white women.
The research data on early development of children who are seconded to the National Institute of Child Health and Human Development.
Women who have studied, monitored from birth until the age of 15 years. At 15 months, the security relationship with the children's mother are evaluated using standard procedures for weaning the child and reunited with his mother in a single laboratory.
The baby is smiling, silent, reaching out, or vice versa had positive reactions when their mothers return is considered safe, otherwise they are to avoid the mother during weaning or not comforted by the return of the mother, the children were considered as unsafe .
pubertal development was assessed by a physical test every year by a nurse or a doctor because the woman 9.5 years.
But the risk and start a volatile environment as evidenced by weak family ties, not the only reason that women mature faster. This is partly due to genetic factors.
In addition, chemical factors can also influence, as well as improving nutrition are considered the trend of the last 150 years, the trigger that causes women mature faster.
The results found that women are not safe (not love) when a child has developed puberty earlier than her age, two or four months earlier than women who are sure of the child.
Pubertal development in girls and the end of the first menstruation of women who are child safe.
Belsky said the environment is collected and the mother-child connection is very influential and should not be ignored.
"From the perspective of evolutionary biology that the things that most concerned about the nature of the distribution of genes to succeeding generations," Belsky said as quoted by ScienceDaily.
He revealed that the phenomenon has become more convinced that man easily reared from puberty or early adolescence, especially since the man could marry earlier.