It's a loaded question. How do people develop interest in a subject? What road-blocks do they encounter from a young age through school and entering the workplace? I've not seen any study that suggests given similar influences women are less interested in technology than men.

It's worse than that. Many will actively look down on you for being interested in math or engineering. You can practically see the look on their face change right after you tell them. Not all women are like this, of course, but it's happened to me pretty frequently.