With a quick search online it looks like you got it backwards. I'm not Catholic, so don't understand the intricacies of every single position, but it looks like there are about 10 times as many "sisters" compared to the number of men serving in the various religious orders.
I should have been clear, I mean "monks" vs "female" monks of all religions. When I imagine a "monk", I imagine an orange clad Buddhist or Hindu person. Still happy to also be proven wrong there too. Always cool to learn new things.