This explains a few things...

[agent00groovey]

Website uses an old browser trick to look at your history and guess if you are male or female.

Here's my results:
Likelihood of you being FEMALE is 74%
Likelihood of you being MALE is 26%

Comments

[specialagentm]

I got exactly the same ratios. Glad to know we're both equally-girly men, I was worried I wasn't keeping up.

Oh yeah!

[dtabraha]

Likelihood of you being FEMALE is 58%
Likelihood of you being MALE is 42%

Damn, I guess that's what happens when you visit babycenter.com!
A little scary, but also genius as to how they figure out your history.

Site Male-Female Ratio
google.com 0.98
wikipedia.org 1.08
mapquest.com 0.83
blogger.com 1.06
imdb.com 1.06
yellowpages.com 0.72
apple.com 0.89
edmunds.com 1.41
blockbuster.com 0.83
babycenter.com 0.69
tirerack.com 1.86
johnmccain.com 1.27
gm.com 1.3
goodsearch.com 0.59
mentalfloss.com 0.75

Even more interesting though, is that of the top 100 sites, only 14 are designated male and 49 of them are designated female.

The only ones that were clearly male (not slightly) were digg.com, metacafe.com, and... youporn.com

Re: Oh yeah!

[dtabraha]

Also interesting, I just noticed that they listed johnmccain.com, but not barackobama.com even though both are in the quantcast list.

barackobama.com: 2.7M people, 58% female
johnmccain.com: 1.4M people, 56% male