A few weeks ago I came across an article that said women seeking recreational sporting opportunities can have quite a hard time with it. There are several reasons for this. Because women generally have less free time, often having to work outside the home and shoulder the majority of household responsibilities, there just are not enough interested women to comprise teams and leagues. Also, because women, as young girls, were less exposed to and encouraged to play sports, they often don't seek out something unfamiliar in adulthood.
The growing number of girls whho play sports is most likely to effect change in the latter situation, hopefully bringing about more opportunities for adult women.
Also, sometimes finding out about what's out there in terms of sports for adult women can be difficult. So I've added to the sidebar programs and teams for adult women that are either women-only (W) or co-ed (C). It's a work in progress and will be organized by state. If you know of a team/league that has a website I can link to, let me know (firstname.lastname@example.org) and I will post it.