Three of the women's orgasms consistently included only a series of regular contractions (orgasm type I). For six other women, orgasms consistently continued.
Contractions seem to frequently accompany subjective experience of female orgasm, but are not its necessary condition. Some women experience their orgasm.
Vaginal contractions are contractions of the pelvic muscles surrounding the vagina, especially Three of the women's orgasms consistently included only a series of regular contractions; for six other women, orgasms consistently continued.
Eleven nulliparous women manually self-stimulated to orgasm, each on three separate occasions. Pelvic contraction pressure was measured by an anal probe.