I think one would be hard-pressed to find anyone who claims there are no significant differences (at some point, the question reduces to one of definition). Th

I think one would be hard-pressed to find anyone who claims there are no significant differences (at some point, the question reduces to one of definition). The argument is over what those differences are, how much they matter (i.e. a 1% difference in the mean? Who cares), and how malleable they are given modern medical science. (And that's before one gets on the topic of whether those differences should imply a societal structure that pigeon-holes people based on their biological sex).