'In this book Professor Glover draws on his detailed comparative studies of reproduction to provide insight into the evolution of the male reproductive tract as well as male mating behaviour. He uses his quirky sense of humour to challenge our thoughts on various aspects of the subject, and stimulates us to reconsider some well-entrenched 'facts'. For students, his writing emphasises the importance of challenging dogma, and exposes the excitement of scientific endeavour. Inevitably, some of the questions he raises remain open-ended, providing the challenge for future investigators to examine them further. His easy style makes the book a pleasure to read, it is a 'page-turner' that gathers one up in the excitement of discovery and the development of ideas about an important subject.' Michael Bryden, University of Sydney