What's the default gender?

Whenever I see Male as the default gender on a sign up screen I wonder, is this because there are more dudes on this site? Or is this because unlike the Titanic, it's men first?

A story: I bought a cute puppet recently made by a woman in Texas. Someone said it was a male.

Me: "No, she's female, what makes you think it's a boy?"
Him: "When animals are naked and don't wear a bow or a dress, they are male"
Me: "WHAT!?"

So I guess the muppets, smurfs set the rules. But, men are not the default for me. Probably because I'm not one. Too bad being the majority (barely) doesn't get you default status.

No bow, no dress.  Female!