In medical terms, a female orgasm is defined as:

The peak of sexual arousal, when all the muscles that were tightened during sex relax. This causes a pleasurable feeling that involves the genital area and sometimes the entire body. Muscles throughout the body spasm, including those of the pelvic floor, anus, vagina and uterus. During orgasm, most women experience increased heartbeat rates, faster breathing and increased blood pressure. Endorphins are released into the bloodstream causing feelings of pleasure, joy, giddiness, warmth, sleepiness or excitement.

Sometimes, stimulation of the G spot can lead to a clear fluid spurting out of the urethra during orgasm. This fluid is similar to the fluid secreted by the prostate in men. About 10% of women experience female ejaculation during G spot orgasms.

Most women need a break after a female orgasm, to stop or greatly reduce sex play, because they feel too sensitive to enjoy continued stimulation. After a rest, they may or may not be ready to experience more orgasms. But some women don't need to stop after a single orgasm, and can have several in a row. This phenomenon is called experiencing multiple orgasms and isn't uncommon. Women who generally don't experience multiple orgasms can frequently achieve them through the use of sexual enhancement products.

Many women, about 30%, have difficulty achieving orgasm during intercourse. This is often due to the mechanics of female orgasm. The clitoris is the most sensitive part of the female genitalia and sometimes can be difficult to stimulate during sex. Female sexual dysfunction is a different condition that can have physical or psychological/emotional roots and is not directly related to the sensations of intercourse or sex play.

Generally speaking, women who experience female orgasms during sex are women who masturbate to reach orgasm. Masturbation teaches a woman about her body, what kinds of stimulation she likes, etc. A woman who is comfortable with her body is far more likely to achieve female orgasm during intercourse.

The mysteries of the female orgasm are not so much in what physiological effects they cause, but rather how to experience more and better orgasms. The more a woman knows about her own body, and about female orgasms and orgasm techniques in general, the more likely she will be to have orgasms when alone and when with her partner