Let's talk about sex. Not boring, human sex, but the endlessly fascinating, varied and complex forms of reproduction that can be found in the rest of the natural world. Whiptail lizards and California condors are capable of immaculate conception, while clownfish and bearded dragons regularly switch between male and female.Sex in slime molds can involve three mating types. For some fungi, it's twenty-three thousand. And for algae, every single organism is a potential mate - a veritable bonanza. Lixing Sun has spent decades expanding the bounds of what we know about reproduction, in all its many flavours. And as it turns out, sex is far more complex and eye-opening than we ever could have imagined.