Scientists from the University of Adelaide (Australia) made a sensational discovery. It turns out that the female body may be unconsciously voters to sperm, allowing the sperm to fertilize an egg of one man, but rent the seed of another, news agency AFP.

Sperm “suitable” men contains specific signaling molecules that cause immune changes in the female organism, says Sarah Robertson. As a result, the immune system “misses” sperm, giving them the opportunity to reach the egg.

Sperm also other partners, although perfectly healthy, not able to activate immune changes and therefore does not pass in the body “quality control”. Thus, the body checks on the compatibility of each sex partner, weed out unsuitable.

However, sometimes the perfect at first glance, the system collapses. This occurs when the signals suitable male sperm are not strong enough, or when the woman’s body becomes overly “selective”, write more. In addition, the immune system can not take the sperm if the sperm of men do not fall into the woman’s body for at least the previous three months.

Scientists plan to continue the study of women of “quality control” of sperm and hoping that the results of work they will be able to create new methods of fertility treatment.