28Weir, Anthony, and James Jerman. Images of Lust: Sexual Carvings on Medieval Churches. London: B.T. Batsford, 1986. 15.
According to Anthony Weir, "The' gigg/jig' word (like 'crack' or, falsely, 'craic') does definitely seem to be English in origin, and, curiously, West African coastal people retained the word jig-a-jig for sexual intercourse; little brass [copulating] figures, now sold to tourists, are/were also called jig-a-jigs. This would suggest, as Barbara Freitag said, a 16th century origin for the word." (Weir, Anthony. "Ballyvourney and Its Sheela." Message to the author. 11 Nov. 2012. E-mail.)