I don't know about all women, but I slept with this one girl who squirted like a firehose when she came. Her roommate (who had also slept with her) said she got hosed as well, except she took it in the eye whereas we were actually having sex when I got hosed. I'm inclined te believe it was genuine, as it didn't smell like piss, she actually gushed about 3 seperate times, rather than all at once.

But that's just my experience. Cytherea's squirting looks kind of bogus to me, for what it's worth.