Nā lāʻau antisperm (ASA) - nā antibodies i hana ʻia e ke kino o ke kanaka me nā antigens sperm (Krause 2017: 109) ʻO ka hoʻokumu ʻana o ASA kekahi o nā kumu no ka hoʻohaʻahaʻa ʻana i ka momona a i ʻole ka infimility autoimmune: pili ka ASA i ka hana o ka spermatozoa, hoʻololi i ke kaʻina o ka hopena acrosomal (AR), a me ka hoʻoluwale i ka hoʻomakeʻa, implantation a me ka hoʻomohala o ka embryo (Restrepo 2013) kumu kumu fragmentation (Kirilenko 2017) Ua hōʻike nā haʻawina ma nā ʻano holoholona like ʻole i kahi pilina ma waena o ka ASA a me ka embryo degeneration ma mua a i ʻole ma hope o ka implantation (Krause 2017: 164) Ke nānā nei nā hopena contraceptive o ASA i ka wā e hoʻomohala ai i ka maʻi kūlohelohe kūloko e kū pono ai i nā kānaka (Krause 2017: 251), me ka hōʻemi a kāohi i ka nui o nā holoholona hihiu (Krause 2017: 268).

Mai ka waenakonu o ka kenekulia 20, ma lalo o ka hae o ka "overpopulation krisis", ke hele nei ka honua i ke kaua propaganda honua e manaʻo nei e hōʻemi nui i ka ulu nui a me ka hoʻohaʻahaʻa ʻana i ka lehulehu. Ma nā ʻāina ākea, ua hāʻule iho ka helu o ka hānau ma lalo o ka pae o ka hōʻoluʻolu o ka lehulehu, a ʻo ka nui o ka poʻe ʻelemakule e like me ka nui o nā keiki a ʻoi aku paha i kēlā. Hoʻomaka ka male ʻana i ka mare ʻana a hoʻololi ʻia e cohabitation. ʻO nā hihia extrramarital, ka homosexuality a me transgender phenomena ua loaʻa ke kūlana kiʻekiʻe. Kaopae ʻana, ʻaʻole i ka ʻike "overpopulation" lilo i mea hou o ka honua.