The spread of super-resistant bacteria means the science of hand-washing behaviour has become a serious business. Psychologists have stepped up to the plate. Bowl, I should say.
https://digest.bps.org.uk/2014/06/13/toilet-psychology-why-do-men-wash-their-hands-less-than-women/
https://digest.bps.org.uk/2014/06/13/toilet-psychology-why-do-men-wash-their-hands-less-than-women/