Los Angeles, The signs of women are in the fertile period can be observed from many things, ranging from changes in body temperature until the viscosity of mucus in the pubic area. Can also of changes in his attitude on his father, which suddenly keep a distance and rarely called.

The change this attitude seldom recognized, but it always happens when women are at the most fertile period. Experts believe this is a woman’s instinctive control mechanism to avoid the occurrence of incest or incest marriage.

Presumably this mechanism is not only shaped by norms and culture, but also influenced by natural factors, including the evolution of human experience from time to time. For some species of animals reportedly also show the same behavior, away from the males that are still related.

In humans, changes in fertility behavior is observed by experts from the University of California, Los Angeles (UCLA) recently. Respondents who were involved included 48 fertile women aged between 18-22 years ie.

“Women are more often called his father when he was at the most fertile period, and not too much to say as though his father had taken the initiative to contact,” said Martie Haselton of UCLA ,Wednesday (01/12/2010).

In contrast, this study reveals that women who are fertile tend to be more frequent contact his mother. In the most fertile period, the average respondent contact her 4 times more frequently than on a typical day.

Research published in the journal Psychological Science is not the only one who revealed behavioral changes in women when entering the fertile period. Several previous studies have linked the fertile period with the instinct to dress and sexy clothes shopping.