What happened?

I left for work about 20 minutes later than usual this morning. When I hit the main commuting artery, I got a shock - it would be no exaggeration to say that 130% of the cyclists were female. The normal ratio is about 10 guys to 1 girl. Maybe blokes just get out of bed earlier, or have fewer childcare duties to attend to - dunno. All I know is that I was completely surrounded by girls. That's odd.