Orgasm is different for everyone. There's so much pressure on sexually active people to have an orgasm, that many don't because of it. Its even possible that someone has had an orgasm and not realized it due to expecting something different. I suggest reading The Multi-Orgasmic series by Rachel Abrams and co. It will give you information about orgasms and different techniques to achieving one. Don't be discouraged! Everyones body is different, as well as what arouses them.