Well, the modern society is less like the savanna, which was the environment that shaped men throughout the evolutionary history of our species, and more like the cave, which was the environment that shaped women. Less physical confrontation, more squabbling. Less concrete, immediate dangers, more abstract worries. Less ass-kicking, more cooperation. Heck, even spatial abilities are so last-century, now that everyone…
Half a century--two human generations--is not nearly enough time for evolutionary pressures to have the sort of effect you are talking about. Least of all in a society of abundance in which the majority of members reproduce. Instead, I'd suggest you look at the various changing environmental factors for an explanation of these phenomena: BPA in plastics ( http://en.wikipedia.org/wiki/Bisphenol_A ), the growing use of…
Measure the testosterone level in your bloodstream.
Then for a few weeks start doing heavy squats (weight lifting) every other day, go car racing, skydiving, etc.
Now measure T again. See the difference?
There are all sorts of things like that. The bottom line is, the more secure the environment, the less the need for men to be "men".
Also, I was not implying that the new evolutionary pressures have already made changes, I was just saying the changes are being made now - but how long before they will become visible, I have no idea. Probably not tomorrow.