Being a woman, a man or otherwise is more than just a difference in genitalia

Recently published research raises the intriguing possibility that as far as our brains are concerned, we may all be bi-gendered to varying degrees

In an arguably transphobic tirade, Germaine Greer recently decreed that "Just because you lop off your penis and then wear a dress doesn't make you a ******* woman". The resultant backlash included attempts to prevent her lecture at Cardiff University and Elton John muscling in to the debate, accusing her of "living in another century". What it means to be male and female remains controversial, emotive and intriguing in both society and science.

Being a woman or a man or otherwise is more than simply a difference in our genitalia. Our gender often goes to the core of how many of us identify ourselves. Can a twenty-first century understanding of potential similarities and differences in brain structure between the sexes provide us with useful information? I think so.