Complex sentence: A person may have an orgasm from one type of stimulation but not from another, achieve orgasm with one partner but not another, or have an orgasm only under certain conditions or only with a certain type or amount of foreplay.
Split into simpler sentences: A person may have an orgasm from one type of stimulation but not from another. Or a person may achieve orgasm with one partner but not another, or have an orgasm only under certain conditions or only with a certain type or amount of foreplay.