'Sex and gender have become highly politicized characters in confused and often ill-informed debates. This book, with scholarly contributions from across the sciences, throws a clear and immensely welcome light on why both sex and gender matter, and how the relationship between the two is a matter of evidence, not of personal opinion.' - Ann Oakley, University College London, UK'An important and extremely timely collection of essays that presents a valuable overview of current research investigating the relationship between sex, gender, and gender identity in the UK today.' - Sarah Pedersen, Robert Gordon University, UK