Females have an almost unlimited orgasmic potential. This depends on many factors, including sexual excitement level, sexual interest, alcohol or drug intoxication, fatigue, etc. Some women experience multiple orgasms frequently. Conversely, I have talked with female students at the U of A who have never experienced an orgasm during sexual intercourse or other sexual stimulation. It is uncommon for a woman to experience multiple orgasms during most of her sexual activity.
Men are a different story.
Immediately after ejaculation, the male enters a recovery period during which time he becomes physically unable to have another orgasm or ejaculation. There is great variability in the length of the refractory period from male to male, and also within the same male. While an erection may be partially or fully maintained during the refractory period, the interval between orgasms may last from a few minutes to a few hours. If you have questions or concerns about sexual issues like orgasm, talk with your health care provider, a health educator, or a counselor at the Campus Health Service.