There is also the vicious cycle of more men riders bring in other men riders and so on. When I started riding it was because three other women I knew had just started, and we had a group of about the same ability starting out and learning everything together. That is fairly rare. If I hadn't known them, I might not have gotten started because I doubt I would have gotten into it on my own or with a group of guys because it does seem intimidating.
Grits
2010 Trek 5.2 Madone WSD, SI Diva Gel Flow
2002 Terry Classic, Terry Liberator