Back in 2002, I spent a long senior-year semester as an editor for the Reed College Quest, which distinguished itself for printing anything because it couldn't afford to be picky. I suppose the experience gave me some insights about the nature of editing and publishing, but what I remember most was the deep animosity I developed for the dopey bro who submitted 1200-word, barely-intelligible essays about his favorite burritos every damned week.
Bicycling takes time. And this is something that, by the numbers, women have less of than men. In 2004, employed women reported an average of one more hour of housework per day than their employed male counterparts. These same employed women reported twice the time spent caring for young children. Employment status being equal, we have more household duties and are far more likely than men to be caregivers for aging relatives.
These kinds of responsibilities add up to more complicated transportation needs. Women make more trips than men, with diverse kinds of trips chained together. And twice as many trips as men's are at the service of passengers -- that is to say, the school drop-off, soccer practice, and the play date wedged in there between the grocery run and the commute to work (see pages 15 and 16 of this paper). No wonder the minivan is inextricably linked with motherhood in America.
We can hope that one day none of these duties will be tied to gender. Until then, statistically, if you're a woman, biking is going to be less accessible to you than for your statistical male counterpart.