My wife has never 'squirted' in an ejaculatory way. She's a gusher. During a particularly strong or long orgasm she will experience a much greater than normal discharge of fluid. It's thinner than normal lubrication and feels quite warm as it travels along our skin.
There are two circumstances where we achieve this experience - both involve deep vaginal stimulation. The area known as the a-spot or AFE Zone is where the vagina and cervix meet. It has been pretty well documented that stimulation of this area increases vaginal lubrication by a substantial amount. link
Method 1: My wife is a real cowgirl. She loves being on top. When she is she can position the head of my erection just where it feels best. Although she may do some thrusting - I describe it more as grinding. This motion also allows for her clitoris to be stimulated by my pubic bone - even the SS Omega ring I wear most of the time. While all this is going on I am either working her hips with my hands - or massaging her breasts - sometimes with some fairly strong nipple tweaks as her orgasm begins.
Method 2: This is an all toy affair. It involves a fairly large penetrating toy like the Vixskin Maverick or the G4 Big Boss vibrator - coupled with her mystic wand clitoral vibe. Variations include a finger or vibrator in her ass. I watch carefully as she becomes more aroused - the penetrating toy will press deeper in side. If I try to go too deep too soon - it hurts. But as she falls deeper into the experience - she sighs and on the exhale the toy will go deeper.
I'd say that the gushing occurs about 15-20% of the time when using either Method 1 or 2.
Good luck and enjoy trying!