Pelvic muscle strength of female ejaculators: Evidence in support of a new theory of orgasm

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Abstract
Kegel's theory (1952a) concerning the sexual importance of the pubococ‐cygeus muscle was combined with Singer's theory (1973) of “uterine” orgasms to produce the hypothesis that women who ejaculate at orgasm have stronger pelvic muscle contractions under voluntary control than women who do not ejaculate. The vaginal myograph and a new “uterine myograph” developed for this project were utilized to measure EMG levels in 47 women. Ejaculators were found to have significantly stronger pubococcygeal muscle contractions and significantly stronger uterine contractions than non‐ejaculators. The Grafenberg spot, an area of exceptional sexual sensitivity located in the anterior wall of the vagina, was identified in every subject. Hartman and Fithian's version (1974) of Kegel's theory of vaginal sexual sensitivity at “4 and 8 o'clock” was not supported; sexual sensitivity was focused at 12 o'clock in 90 % of the subjects. Kaplan's description (1974) of two “phases” of orgasm (in males) is expanded to account for ejaculation in both males and females. Female ejaculation is hypothesized to be a component of some women's “uterine” orgasms. The limitations and problems of research on orgasmic response are discussed.

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