And it's not just an academic definition, it's pretty common.
It's more common now than it was 10 years ago, but it's fairly uncommon if you aren't sampling from just young liberals.
The fact of the matter is, what chromosomes you have don't always equate to how you act, think, or look.
This is the important take-away from these kinds of discussions. People don't act masculine/feminine because of biology, but because of culture. The behavior we associate with men and women changes dramatically based on the society or time period that you're looking at.