Co-op at our house looks a little different these days: swords, cars, and "Voltron" have replaced dress up's and stuffed animals. Gone are the days of girly-er movies and feminine influence.
Two of the families had grown out of the co-op need (each family had three girls). We've replaced those girls with one toddler boy who has another brother or sister on the way. Gender count: boys 6, girls 1 (with a hopeful 2 coming soon).
Co-op is certainly different for Leah. She struggles not having anyone her age our even another girl around. Although we've been giving her good babysitting practice with the boys 2 and under.