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Sexual dimorphism is a term for the phenotypic difference between males and females of the same species.
Direct sex differences follow a bimodal distribution.
"Of the 80 disorders diagnosed in adulthood for which sex ratios are provided, 35 are said to be more common in men than in women (17 of which are substance related or a paraphilia), 31 are said to be more common in women than men, and 14 are said to be equally common in both sexes." Differences in male and female jealousy can also be observed.More recently, medical research has started to understand the importance of taking the sex into account as the symptoms and responses to medical treatment may be very different between sexes.Neither concept should be confused with sexually transmitted diseases, which are diseases that have a significant probability of transmission through sexual contact.Sex differences in medicine include sex-specific diseases, which are diseases that occur only in people of one sex; and sex-related diseases, which are diseases that are more usual to one sex, or which manifest differently in each sex.For example, certain autoimmune diseases may occur predominantly in one sex, for unknown reasons.