All I can say, is that when my g spot is stimulated really fast and sort of roughly (like texture, circumcised glans do it for me) I feel the urge to pee. I can usually stop it but it limits my orgasm, so whenever I masturbate at home I make sure my bladder is empty and I get a trickle when I cum.

I've never had a glove or a guy try to 'make me squirt'.