Dr. Tatiana's Sex Advice to All Creation: The Definitive Guide to the Evolutionary Biology of Sex

You'll learn why one stick-insect copulation lasts for 10 weeks (to prevent other males from gaining access to the fertile female) and why the black-winged damselfly's penis has bristles (to scrape out his rival's sperm). You'll learn that male and female orangutans masturbate with sex toys fashioned from leaves and twigs, that slugs are hermaphrodites with penises on their heads, and that females in more than 80 species eat their lovers before, during, or after sex. You'll also ponder human sexuality when you learn that "monogamy is one of the most deviant behaviors in biology" (although jackdaws, chinstrap penguins, California mice, and some termites swear by it) and "natural selection, it seems, often smiles on strumpets."

Highly recommended--you'll read this through just for the fun of it and have plenty of odd facts with which to dazzle your dinner companions. --Joan Price