In that case, I should make movies. anywho, my gf does that. she cant control it but she knows when its coming. each girl is different but for my case, its when im only partway in at an upward angle, getting faster to work her up properly, and she starts to "squeeze", and she cant really help it. its when she squeezes kinda hard, (and you get used to feeling the right time) I pull out and rub the clit, and she can squirt or gush, either one. if you dont pull out, it cant get out, in my case, its only in certain positions, because I'm a little too big. we've been having sex for a year, and she can't handle it all in some(most) positions. If she squirts too much, she hurts later, but I think its hot. From what Ive read/learned, ANY girl can squirt, its whether or not they(or you) can make it happen.
Best of luck, it is a HUGE turn on for me.