Excitement: when sexual arousal begins (women- increased blood flow to labia, erection of clit and nips, vaginal lubrication-- men- get hard and testicles elevate)
Plateau: when sexual arousal is maintained (women- increased muscular tension in outer third of vagina and surrounding muscles-- men- may have secretions of fluid from bulbourethral glands, penis more erect, testicles further elevate)
Orgasm: the subjective experience of pleasure and release at sexual climax (brief sequence of muscle contractions, heart rate increase, accompanied by emission and ejeculation in men)
Resolution: physical signs of sexual arousal subside, muscles relax, heart rate and blood pressure return to normal, about 15 mins