text: how do you know when you orgasm? i think i have orgasmed before but i am not. sure. what signs tell you, you have? rhythmic muscle contractions occur in the outer third of the vagina, the uterus and anus. the first muscle contractions are the most intense, and occur at a rate of about 1 per second. as the orgasm continues, the contractions become less intense and occur at a more random rate.   a mild orgasm may have 3 -5 contractions, an intense orgasm 10 -15.  the "sex flush" (redness) becomes even more pronounced and may cover a greater percentage of the body.  muscles throughout the body may contract during orgasm, not just those in the pelvic area.  some women will emit or spray some fluid from their urethra during orgasm. this is often called female ejaculation.   a woman's facial expression may indicate that she is in pain when she is having a pleasurable orgasm.  at the peak of orgasm the entire body may become momentarily rigid.