1. Animal homosexuality in evolutionary perspective 2. The comparative study of homosexual behaviour 3. Genetics of homosexuality 4. Ontogenetic patterns 5. The endocrine and nervous systems: a network of causality for homosexual behaviour 6. Immunology and homosexuality 7. Sexual segregation effects 8. The social, life-histories and ecological theatres of animal homosexual behaviour 9. Homosexual behaviour in primates 10. A biosocial model for the evolution and maintenance of homosexual behaviour in mammals and birds.
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