In reply to:
In my view, the only certain thing is that the relevant scholars and researchers simply cannot agree on what the available evidence tells us about the nature and origins of sex differences. Obviously, individual scholars will often have a position but that doesn't mean there is scientific consensus (although often the most strident will disingenuously claim that there is consensus).
To counter books like 'why men can't iron' etc. (which really are generally pap in my professional opinion), I would offer this book as a good read if anyone is really interested in this topic:
http://www.amazon.co.uk/Delusions-Gender-Science-Behind-Differences/dp/1848...
The work of Anne Fausto-Sterling is also very interesting. But the proponents of 'hard wired' sex differences can easily come along here and post links to other works (even 'proper academic works') that interpret the evidence differently.
My view is that we always need to be very careful with questions of group based differences because of their potential consequences for discrimination. In the absence of definitive evidence, I think it is better not to adopt a position that could very easily lead to discrimination (e.g., girls have poorer spatial skills; boys are rubbish at socio-emotional stuff).
Anyway, my guess would be that this thread will die a death now that it has moved on from 'harmless banter'/misogynistic drivel (delete accordingly, depending on your point of view).