@jeborder You're may be right about fingering as the most scientific choice, but from my personal experience it sure ain't the only way. The G spot is still well stimulated when the tip of the penetrating object goes past it, it's often the back and forth across it that does the trick. With myself and other female partners most squirting has happened from deep penetration positions or fisting, and if I'm by myself, my 8 inch G spot dildo is the most likely. But that's me, and I love deep penetration, so there's the factor that G spot science aside, one of my favorite activities is what makes me squirt because I just love it so much.
That's basically what all the replies have been saying, every squirter is a snowflake. But I'd feel confident going with fingering for your next encounter. Also, don't forget that learning how to make your specific partner squirt can be approached as a fun, sexy adventure for the two of y'all; if it doesn't happen on the first try look at it as an exciting relationship goal instead of a failure. It's always part of a new relationship to learn your new partner. And natural inclination is a factor- speaking of shame, some women don't ever squirt, some rarely do, and that is also fine and will have nothing to do with their partner's skill. If a woman prone to squirting is something you're really looking for I'd recommend listing it as a kink on your profile. You'll draw out those who are not just capable but prone to it.