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Furthermore , in Eve 's Seed : Biology , the Sexes , and the Course of History ( 2000 ) , historian Robert S. McElvaine extended Horney ’s argument that womb envy is a powerful , elementary factor in the psychological insecurity suffered by many men .
 Robert S. McElvaine, Horney
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert S. McElvaine, Horney