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| An Invitation to Impropriety | |
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| Darwinizing What Dangles | |
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| How Are They Hanging? This Is Why They Are | |
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| So Close, and Yet So Far Away: The Contorted History of Autofellatio | |
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| Why Is the Penis Shaped Like That? The Extended Cut | |
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| Not So Fast … What's So "Premature" About Premature Ejaculation? | |
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| An Ode to the Many Evolved Virtues of Human Semen | |
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| Bountiful Bodies | |
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| The Hair Down There: What Human Pubic Hair Has in Common with Gorilla Fur | |
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| Bite Me: The Natural History of Cannibalism | |
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| The Human Skin Condition: Acne and the Hairless Ape | |
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| Minds in the Gutter | |
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| Naughty by Nature: When Brain Damage Makes People Very, Very Randy | |
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| How the Brain Got Its Buttocks: Medieval Mischief in Neuroanatomy | |
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| Lascivious Zombies: Sex, Sleepwalking, Nocturnal Genitals-and You | |
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| Humans Are Special and Unique: We Masturbate. A Lot | |
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| Strange Bedfellows | |
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| Pedophiles, Hebephiles, and Ephebophiles, Oh My: Erotic Age Orientation | |
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| Animal Lovers: Zoophiles Make Scientists Rethink Human Sexuality | |
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| Asexuals Among Us | |
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| Foot Play: Podophilia for Prudes | |
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| A Rubber Lover's Tale | |
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| Ladies' Night | |
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| Female Ejaculation: A Scientific Road Less Traveled | |
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| Studying the Elusive "Fag Hag": Women Who Like Men Who Like Men | |
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| Darwin's Mystery Theater Presents … The Case of the Female Orgasm | |
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| The Bitch Evolved: Why Are Girls So Cruel to Each Other? | |
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| The Gayer Science: There's Something Queer Here | |
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| Never Ask a Gay Man for Directions | |
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| "Single, Angry, Straight Male … Seeks Same": Homophobia as Repressed Desire | |
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| Baby-Mama Drama-less Sex: How Gay Heartbreak Rains on the Polyamory Parade | |
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| Top Scientists Get to the Bottom of Gay Male Sex Role Preferences | |
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| Is Your Child a "Pre-homosexual"? Forecasting Adult Sexual Orientation | |
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| For the Bible Tells Me So | |
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| Good Christians (but Only on Sundays) | |
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| God's Little Rabbits: Believers Outreproduce Nonbelievers by a Landslide | |
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| Planting Roots with My Dead Mother | |
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| Into the Deep: Existential Lab Work | |
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| Being Suicidal: Is Killing Yourself Adaptive? That Depends: Suicide for Your Genes' Sake (Part I) | |
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| Being Suicidal: What It Feels Like to Want to Kill Yourself (Part II) | |
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| "Scientists Say Free Will Probably Doesn't Exist, Urge 'Don't Stop Believing!'" | |
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| The Rat That Wouldn't Stop Laughing: Joy and Mirth in the Animal Kingdom | |
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| Notes | |
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| Acknowledgments | |
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| Index | |