The measured traffic is mostly of the networking variety. So here's my theory/observation:

Guys use these sites heavily until they find a girl (with or without the help of these apps.) Then, their usage drops off considerably. Girls use these sites primarily for other reasons so their usage never really has a reason to drop off.

I can't speak for everyone, but finding a girl has never caused a considerable drop off in my site usage.

if I drink water today doesn't mean I will not need to drink tomorrow

From a marketing standpoint, this is very interesting. The same thing is/was happening in gaming. Games that effectively target females (i.e. nintendogs) do surprisingly well.

What does it say that about 5% of the folks building the products, at least here, are women?

It says 95% of us have to make sure we seek out and pay attention to user feedback from females.

For a long time my wife wouldn't use ourdoings.com because it's always easier to just get me to put our photos up. But now that we have a wifi photo frame, she's become active so she can tweak which photos go to the frame and which don't. I have other female users, but this is the best feedback loop I've got.

That hasn't stopped the lingerie industry, has it? I don't think we'll ever see a swing towards more women implementing games. We have, however, seen lots of women making it in game design recently.

I think it says that there is a large, underserved market waiting to be tapped.

I don't think you intended for that comment to make me laugh so hard, but good job either way.