Antenatal autoeroticism:
The alleged case of antenatal autoeroticism was reported by Spanish gynecologists Vanesa Rodríguez Fernández and Carlos López Ramón y Cajal in September last year. Their paper was called In utero gratification behaviour in male fetus. …
Rodríguez Fernández and López Ramón y Cajal wrote that “This is a very clear sexual behavior ‘in utero’ in the 32nd week of gestation”, speculating that the fetus may have been comforting himself by the behaviour. [“Fetal Onanism: A Surprising Scientific Debate,” Neuroskeptic]
I suppose this will be used by anti-abortion forces in the abortion / right to life debate, although the interpretation is not accepted by all relevant scientists, as some claim the ultrasound has been misinterpreted. Fernández and Cajal have cheerfully returned fire.