From my own experience (for what its worth, coming from a guy), even women who orgasm from penetration alone don't do it all of the time. I can hit all the 'spots'--the "A" spot, the "G" spot, the "P" spot, the "XYZ" spot, etc,--but hitting the spots isn't a guarantee of success. The woman's mood, even stresses of the day, has a lot to do with it--are they nervous, are they anxious, are they scared about your size, are they currently mad at you for leaving the seat up--that doesn't lend itself to a fulfilling love-making session. Just because a woman hasn't doesn't necessarily mean they cant. Just my thoughts, as I said, form a guy with a little experience . . .