STAGE1- EXCITEMENT
10-30 seconds after arousal

Vagina becomes lubricated. It also expands and lengthens.
Swelling of the outer lips, inner lips, clitoris and breasts
The heart rate quickens, muscle tension increases and breathing rate is faster.

STAGE 2- PLATEAU
Can last several minutes

Clitoris disappears into its hood.
Opening to the vagina narrows

STAGE3- ORGASM
Generally only lasts a few seconds

Vagina walls vibrates rhythmically
breathing becomes must faster
Blood vessel engorgement reaches a peak
Reasoning center in brain shuts down

STAGE 4- RESOLUTION
Can last up to 30 minutes

Uterus and clitoris return to their normal positions
Some women are capable of a rapid return to the orgasm phase with further sexual stimulation and may experience multiple orgasms

SOURCE: HEALTH24