I ngā wā o mua, i te nuinga o ngā porihanga ka whakaaetia te whakapononga i raro i ngā ture, i ngā tikanga rānei o te porihanga. Ināianei e aukatia ana i raro i ngā ture o ngā whenua katoa o te ao. Ahakoa tērā, e haere huna tonu ana, ā, i te tau 2019 i te takiwā o te 40 miriona ngā pononga huri i te ao, e 26 ōrau o rātou he pononga tamariki, e 71 ōrau he wahine. Ko te nuinga o ngā pononga he whakamahi mauhere i rō wheketere.