Tears can kill a man's sexual desire, because a woman's tears contain a 'chemical signal' that reduces the man's passion. Thus the discovery presented a study at the Weizmann Institute of Israel.
Some people may reject the information entirely because the study relies on the existence of long-debated pheromones. But Professor Noam Sobel, who leads the original study at the Weizmann Institute, said there is ample evidence to suggest that women's tears really do affect men, for a number of reasons.
Professor Sobel told BBC World Radio Service that the tear-stimulated 'chemical signals' lowered testosterone levels, as well as brain activity associated with sexual arousal. According to the Weizmann Institute's findings, men who see tears make them think that if women look less sexually attractive. Levels of the hormone testosterone associated with sexual arousal in men decreased, averaging 13 percent after they saw tears, and did not change when seeing tears made from brine.
The researchers also say that the physiological state of men, as measured by skin, temperature, heart rate, and breathing also decreases. Brain scans with MRI also show less activity in the brain area. The researchers mentioned that male volunteers can not distinguish salt water and tears. Both are odorless and have the same color and constituents.
"This study reinforces the idea that human, even unconscious, chemical signals affect the behavior of others," says Professor Sobel in the online journal Sciene Express.
Of course, this study is not convincing. It is also supported by others, and is questionable.
"I think this study has been using sound methods and the results are really interesting," said Ad Vingerhoets of Tillburg University in the Netherlands, told Nature at the time. "But as far as I know, there is no clear logical, theoretical, or empirical justification for designing a study of the effects of tears on sex"
There is such an idea that the effects of sex crying can be attributed to the evolutionary theory of neural effects on behavior. Simply, the idea that crying calls for attention and sympathy.
Robert Provine, of the University of Maryland explained that the results were consistent with previous suggestions that crying would reduce aggression. Some people think that testosterone can be linked to hostility and anger, while tears can dampen those feelings and also seem to have an effect on melting sexual desire as well.