I liked it. (But how did he manage to find so many photos of really hot girls biking? )

We've discussed many reasons why here elsewhere, but there's one more thing, and it's just the feedback effect. There aren't many women (I refuse to say girls unless we're actually talking about under 25 here) in the sport because there aren't many women in the sport. Many women are put off from a heavily male-dominated sport precisely because it is male-dominated. I like riding with guys, but I don't like riding with only guys, all the time. But at some point there will be enough women involved to defuse that "dude-sport" image. It certainly happened to climbing.