If you have, indeed, always been this way, you may never have intense orgasms as you would have already experienced that by now. On the other
hand, if the intensity has diminished over time, it might be
aging and/or medications. As the prostate enlarges with age, it can't contract quite as effectively which can interfere with some of the intensity of the nervous response. Take a look at medications (blood pressure and anti-depressents) which can diminish the experience.