Why do some men care about the number of sexual partners a woman has had?
Many men want to feel unique and significant to their partner. They may find it hard to believe that they are the most important man in a woman's life if she has a history of many partners. This desire for exclusivity can lead to a preference for partners with fewer past relationships.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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