i disagree with all women can do it. i discovered the trait when i was in college....and boy was i turned on by it. it was my goal to smash as many girls and get them to squirt. it definitely is a skill involved with the guy. not all guys can make you do it....and for those whom have learned to self pleasure themselves to doing it....its about relaxing and letting go. most of my female hoe-a-dex have accomplished squirting either by oral, fingering, or just wild dick action.
i have watched several videos on how to make em squirt everytime....but there are a few who i did not get mastered. so id venture to say 7 out of 10 will squirt given the right technique.