Giorgi, Giorgio, and Siccardi, Marco (1996). “Ultrasonographic observation of a female fetus’ sexual behavior in utero,” American Journal of Obstetrics and Gynecology, 175, 3(1, part 1), 753.
We recently observed a female fetus at 32 weeks’ gestation touching the vulva with the fingers of the right hand. The caressing movements were centered primarily on the region of the clitoris. Movements stopped after 30 to 40 seconds and started again after a few minutes. Furthermore, these slight touches were repeated and were associated with short, rapid movements of pelvis and legs. After another break, in addition to this behavior, the fetus contracted the muscles of the trunk and limbs, and then clonicotonic movements of the whole body followed. Finally, she relaxed and rested.
We observed this behavior for about 20 minutes. The mother was an active and interested witness, conversing with observers about her child’s experience.
Evidence of male fetuses’ excitement reflex in utero, such as erection or masturbation” movements, has been previously reported.
The current observation seems to show not only that the excitement reflex can be evoked in female fetuses at the third trimester of gestation but also that the orgasmic reflex can be elicited during intrauterine life. This would agree with the physiologic features of female sexuality: The female sexual response is separate from reproductive functions and doesn’t need a full sexual maturity to be explicit.