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The two primary considerations are intrinsic quality (e.g., body symmetry, facial attractiveness, etc.) and genetic compatibility (e.g., avoidance of inbreeding such as the incest taboo).Moral disgust "pertains to social transgressions" and may include behaviors such as lying, theft, murder, and rape.In a series of significant studies by Paul Ekman in the 1970s, it was discovered that facial expressions of emotion are not culturally determined, but universal across human cultures and thus likely to be biological in origin.The facial expression of disgust was found to be one of these facial expressions.He compares it to a "behavioral immune system" that is the 'first line of defense' against potentially deadly agents such as dead bodies, rotting food, and vomit.Sexual disgust arises from a desire to avoid "biologically costly mates" and a consideration of the consequences of certain reproductive choices.

In The Expression of the Emotions in Man and Animals, Charles Darwin wrote that disgust is a sensation that refers to something revolting.

It invokes a characteristic facial expression, one of Paul Ekman's six universal facial expressions of emotion.

Unlike the emotions of fear, anger, and sadness, disgust is associated with a decrease in heart rate.

Sensitivity to disgust rises during pregnancy, along with levels of the hormone progesterone.

Scientists have conjectured that pregnancy requires the mother to "dial down" her immune system so that the developing embryo won't be attacked.

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The above-mentioned main disgust stimuli are similar to one another in the sense that they can all potentially transmit infections, and are the most common referenced elicitors of disgust cross-culturally.

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