Have you ever heard of sex blankets? I hadn't either until my good girl started looking for one because the sheets were getting wet when she squirted. Kind of sexy although it does create a mess although there are no stains and it just dries.
Basically, they're waterproof blankets but sex blankets has a better ring to it. And they work.
So for all the squirters out there, I recommend them. You don't read much about squirters so I don't know how many there are out there.