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- 1. An Introduction to the Problem
- Operational Definitions
- A Survey of Animal Genitalia
- Genitalic Extravagance
- 2. Previous Hypotheses: Their Status to Date
- Lock and Key
- Genitalic Recognition
- Pleiotropism
- Mechanical Conflict of Interest
- Summary
- 3. Tests of the Lock and Key and Genitalic Recognition Hypotheses
- Lock and Key
- Species Isolation
- 4. Tests of the Other Hypotheses and a Summary
- Pleiotropism
- Arnold’s Modification
- Mechanical Conflict of Interest
- Summary
- 5. Sexual Selection by Female Choice
- The Function of Copulation
- The Female Choice Hypothesis
- Effects of Female Choice on Genitalia
- Mechanical Fit of Genitalia
- Genitalia and Overall Male Fitness
- Major Evolutionary Patterns That Are Explained
- Relationships to Other Hypotheses
- 6. Male–Male Genitalic–Genitalic Competition
- Sperm Displacement
- Clasping Devices
- Male Adaptations That Short-cut Female Choice
- Topology of Female Reproductive Systems Too
- Summary
- 7. Female Discretion after Genitalic–Genitalic Contact
- Intromission
- Insemination
- Sperm Transport
- Sperm Destruction, Storage, and Activation
- Egg Maturation and Fetal Nourishment
- Oviposition Rate
- Tendency to Remate
- Summary
- 8. Remating by Females
- Strict Behavioral Monogamy Induced by Males
- Copulatory Plugs
- Antiaphrodisiacs
- Short-lived Females
- Monogamy in Termites
- Determining Remating Frequencies
- The Best Field Data on Remating Frequencies
- Heliconius Butterflies: A Test Case
- Sex Ratios and Sperm Exhaustion
- Summary
- 9. Apparent Contradictions of the Female Choice Hypothesis
- Interspecific Differences in Female Genitalia
- Lack of Species Specificity in Genitalia
- High Paternal Investment in Offspring
- Intraspecific Uniformity of Genitalia
- Spermatophore Complexity and Male–Female Contact
- Infrequency of Postcopulatory Courtship
- Patterns of Genitalic Change
- Summary
- 10. Use of Genitalia as Stimulators
- External Movements
- Intromission without Insemination
- Movements within the Female
- Indirect Evidence
- 11. Specialized Nongenitalic Male Structures
- 12. Conclusions and an Overview
- References
- Index
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