Sexual problems with wives? Polish scientists have come to the rescue.

[Poyar]

It's a Google translation, so may be not 100% appropriate, but should be clear.

To cause addiction man from a woman, women use emotional blackmail as an addictive mechanism, sending high-quality sexual signals directed toward other males, or suggesting that other men can do something better. In this way, the man unconsciously wants woman to be even more happy, but do not consciously know what are the actual causes. In this way women acquire and maintain power over a particular man. Once that happens, the woman holds the man in the grip of appearances, subconsciously making him to fulfill her desires, to have better sex. But that did not become - a woman never gives its all, because fully sexually satisfied man is a man over which woman has no control. In this way the woman would limit her ability to control of both the man and her own - mainly financial - desires and needs. A woman hides the blackmail from the man, which regardless of degree of awareness by a woman, is the main determinant of deterioration of women on Earth. The man who is the sole breadwinner, this can lead to serious addiction, alcoholism, depression and even suicide attempts, due to the fact that whenever he tried, all the time gets a subconscious information that the partner expects more. It is a symptom of uncontrolled self-assurance to men.

From another paragraph can be read:

Additionaly, woman, using her voice, automatically exerts a man emotional pressure to ensure a livelihood for the family, which the pressure, the man's brain recognizes as need to discharge of aggression. This is probably the animal atavism, a time when the female was responsible for the offspring and male was gaining food using spears and clubs. Woman's voice is pure from exerting this pressure only when practicing loud sex, and cleanest, while having anal sex.

Source: National Polish Institute of Behavioral Analysis.