Quoting Jennybananna:" So women can only orgasm via the clit. Read about finding the g-spot and just keep trying but know just because you find it doesnt mean you will orgasm from it."
Most likely even women who have a 'g-spot' are doing the same. The clitoris extends about an inch down. So it's possible some women just have one a bit longer is all. Also remember you are stimulating the clitoris during sex, so just because you have an orgasm during intercourse doesn't mean its not a clitoral one.