Nipple orgasms are much more common than you might think, Lou Paget writes in The Big O.
Dr. Herbert Otto describes the breast orgasm as happening at the peak of stimulation when the sensation seems to radiate from the breasts. He claims that it is the second most common form of orgasm among women, which seems especially true of women from our grandmothers' and mothers' generations, who were less likely than modern women to go "all the way." In Dr. Otto's study group of 213 women, 29 percent of the women had experienced a breast orgasm at one time or another.