This book proposes a very interesting theory on how human sperm competition shaped all aspects of human sexuality. But I must say, while most facts about the male half of the population are standard stuff that I already knew from other textbooks, the female half is pure fascination! You're telling me two guys in 1995 knew that human females had "cervical crypts"? That the vagina is a slit and not a cavity? That the cervix can drop down to interact with the seminal pool? Why didn't anyone tell me any of this in any book, class, etc. that had to do with female anatomy and/or function? I would recommend everyone read this book, regardless if they agree with the theory or not, just because of the facts that seem not new to science, but which women likely don't know about our own bodies in 2022! Not to mention the implications this theory has on the world of IVF and other reproductive technologies. Very insightful!