Jones, B., Perrett, D., Little, A., Boothroyd, L., Cornwell, R., Feinberg, D., …Moore, F. (2005). Menstrual cycle, pregnancy and oral contraceptive use alter attraction to apparent health in faces. Proceedings of the Royal Society B: Biological Sciences, 272(1561), 347-354. https://doi.org/10.1098/rspb.2004.2962