Orgasm is a simple reflex response to sexual stimulation,
and can occur as the result of a variety of sexual stimuli. The physical cycle
of arousal, however, is always exactly the same. Though intensity of the
experience may vary from woman to woman, and from time to time, and depend on
the source of stimulation. The Americana sexologists Masters and Johnson have
identified four phases of the orgasmic cycle: excitement, plateau, orgasm and
resolution.
The excitement phase is brought about by sexual
thoughts, emotional closeness and physical attraction. The body immediately
reacts with an increase in general sensitivity and response to caresses.
The sexual organs become filled with blood, so that
they swell both internally and externally. The vagina expands in length and
width and the vulva swells a little. Both the clitoris and labia minora (inner
lips of the vulva) fill with blood and may become darker in color. The vagina
begins to lubricate itself in readiness for sexual contact.
The plateau phase follows immediately. The sexual
organs become extremely sensitive, responding to the caresses of lovemaking.
The vagina expands to become about two inches longer than in the non-aroused
state. It is at this point that intercourse may be taking place, and sensation
by the narrowing of the outer third of the vagina, making it grips the penis
more easily. Lubrication of the vagina continues, and all the muscles around
the sexual organs become tense in a very pleasurable way. The breasts may swell
and the nipples become erect, especially if they are touched. Breathing is deep,
and there may be a light rash over the upper parts of the body.
The clitoris, which is the most sensitive of the
female sexual organs and where all orgasms begin, is now fully erect. Just before
orgasm, it pulls itself back inside the clitoral hood.
Orgasm may now occur. There will be a rush of
extremely pleasurable sensation beginning at the clitoris and moving outwards
into the whole body. The muscles surrounding the vulva, vagina and anus now go
into a series of spontaneous rhythmic contractions, which are delightful
indeed.
The resolution phase then begins immediately after
orgasm. In it, the sexual organs return to a non-aroused state. The volume of blood, which has engorged the
sexual organs slowly, drains away back into the body. Sexual interest may be
aroused again almost immediately, and one or more orgasmic cycles will
recommence.
