There may be nothing unnatural in nature, but nature still encompasses much that seems fantastically strange—the amazingly multifarious sex lives of animals, for example. Sexus Animalis tells us everything we never dreamed we wanted to know about the reproductive systems, genital organs, and sexual practices of animals, from elephants (who masturbate with their trunks) to fruit flies (who produce spermatozoa twenty times their size). In the animal kingdom we find heterosexual, lesbian, gay, and bisexual behavior, as well as monogamy, polygamy, and polyandry, not to mention fellatio and many varieties of erections and orgasms. Emmanuelle Pouydebat, a natural history researcher, tells us about gutter penises, double penises, detachable penises, and corkscrew-shaped penises, as well as vaginas built for storage and clitorises with thorns. (Perhaps unsurprisingly, there’s more data about animal penises than animal vaginas and clitorises.) She explains how the ostrich achieves an erection, describes the courtship of pygmy chameleons, and recounts how the female short-beaked echidna chooses a partner. She reports on sexual assault among animals—there’s evidence that half of female mallards are sexually assaulted—and explains how masturbation helps squirrels avoid sexually transmitted diseases. It seems that animals have been composing their own Kama Sutra throughout the ages. Striking color illustrations accompany the text.
Sexus Animalis is a book that offers exactly what is promises, fascinated information that I never knew I wanted to know about the anatomy and mechanisms of sex for a wide variety of animals and how evolution and natural selection could play their part in all of it. I found the writing style to be accessible with some humor and straight forward information that I never thought about exploring previously. I thought the information included was well researched and organized, and pointed out the gaps in our understanding and how much work there is still to do. I thought the frank and honest explanations were peppered with a nice dose of humor and wit to add another level of interest and entertainment to the read without lessening the credibility of the text. I thought that the illustrations were tasteful and very well done, and helped give readers a more informed awareness of the size and particularities of what is being described in text. I was very interested in the implications of how evolution and other factors have made so many variations on the sex lives of creatures of all shapes and sizes. I never thought much about it, and think there are many people that likewise never considered the complexity and sometimes straight up strangeness of the world around us. This read entertained, informed, and got me thinking a little more about the complexities of the world around us. 
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