I haven't seen an iPad ad in years so I'll have to trust you on that.Think I heard about this argument back in the days when iPad came out and everyone was debating on what color to get lol.
Now I barely see any iPad in black around me in SF Bay Area. All apple ipad ads are featuring white iPads too. I almost forgot that apple still makes black iPads lol.
Where I am in the UK I usually see a definite gender split. Nearly all men I see have the black bezeled iPhones and iPads and nearly all woman the white ones. It's such a big trend here that I actually find I take note when I see a guy with white iPhone, nothing wrong with it but it makes me notice.