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.