Hmmm... well, I must say I treat anything a load of white-coats with a lot of book-larnin', a research grant to spend (and justify) and probably very little practical experience have to say with a healthy and heavy dose of cynicism.
And I do remember, many years ago, hearing on the radio one woman's experience of giving birth saying how different the attitudes to her boy and girl babies were, even from the moment of birth, when she recounted the (male) obstetrician, greeting her newly delivered son with the words 'Well, who's a big, strong boy, then?' whereas her daughters were called 'sweet little things'.
Nurture starts early, it seems.
Having had two sons and four daughters, I would say they were different, but then so were the girls different from each other, and the boys are different, from each other, too.
I, like you Valpollicella, grew up in jeans and plimsoles (or wellies) and was what was called a 'tomboy' so I never imposed (wittingly) any gender stereotyping on my kids, never dressed my girl babies in pink, boys in blue etc and never countenanced restriction due to gender.
There were differences, as they grew up, (they're in their 20's and 30's now, except my youngest 14 yr old son) that one might easily put down to gender, but considering they're subject to so much outside influence, whether we like it or not, and from such a young age, as per my 'radio lady' story, it's honestly a job to say how much is nurture and how much nature.
However, I must say, whatever the differences I may have noticed between my sons and daughters, I couldn't see anything that would have justified denying women the vote until 1928 or the gender pay gap today.
news.bbc.co.uk/1/hi/business/4195852.stm