Medically speaking, an orgasm is defined as the changes in the body when there is intense pleasure, causing an increase in pulse rate and blood pressure, explains Dr. Orgasms can also cause spasms of the pelvic muscles that cause contractions in the vagina and contractions of the urethra in penises, she adds. Shepherd explains that thanks to the neurochemicals released during orgasm, an orgasm can feel like a sensual trance and create a state of sexual ecstasy that you can feel both physically and psychologically. There are some physical signals that can clue you in if you're on your way too. When you're aroused, your heart beats faster, your breathing quickens, your nipples become erect, and your genitals become engorged with blood.