Plenty of women cycle in Philly. I see them all the time while commuting and running errands. The bike share program has increased that number. Lots of women also participate in club rides. Been on and/or led hundreds of club rides since 2005. Only once did I see a guy aggressively try to get a woman's digits. A few of us chuckled silently because we knew she way gay. There is even a women's cycling club:
Sturdy Girl Cycling - Philadelphia Cycling Club for Women
Things are way different than when I started riding for sport back in the mid-80s. Seeing women on sport rides was not common like it is today. They were more common on transportation/commuting rides, but still not nearly as prevalent as men.