Ma loko o ka mōʻaukala, ua pili ka ʻano o ke kāne i kāna testosterone hormone kāne mua. Ma kahi o 30 mau makahiki, hoʻomaka ka emi ʻana o nā pae testosterone a hiki i kēia ke hopena i kekahi mau loli maikaʻi ʻole i kona olakino kino a me ke olakino: ka emi ʻana o ka hana moekolohe, ka haʻahaʻa o ka ikehu, ka emi ʻana o ka nui o nā ʻiʻo a me ka hoʻonui ʻana i ka momona, a me nā mea ʻē aʻe.
E hoʻohui pū i kēia me nā mea haumia o ke kaiapuni, ke kaumaha a me ka ʻai ʻole maikaʻi ʻole i mea maʻamau i ka hapa nui o ko mākou ola a ʻaʻole ia he mea kupanaha ke ʻike nei mākou i kahi maʻi ahulau o ka testosterone haʻahaʻa i nā kāne ma ka honua holoʻokoʻa.
I ka makahiki 2013, ua noiʻi kahi hui o nā kānaka noiʻi Kōlea i ka hopena o ka hōʻike ʻana o nā testicular ikukui laser ʻulaʻula (670nm) a me ka infrared (808nm).
Ua hoʻokaʻawale nā kānaka ʻepekema i 30 mau ʻiole kāne i ʻekolu mau pūʻulu: kahi hui kaohi a me ʻelua mau pūʻulu i hōʻike ʻia i ke kukui ʻulaʻula a i ʻole ka infrared. I ka pau ʻana o ka hoʻokolohua 5 lā kahi i hōʻike ʻia ai nā ʻiole i hoʻokahi lāʻau lapaʻau 30-minuke i ka lā, ʻaʻole i ʻike ka hui kaohi i ka piʻi ʻana o ka testosterone a ua ʻike ʻia ua kiʻekiʻe nui nā pae testosterone i nā ʻiole i hōʻike ʻia i ka ʻulaʻula a me ka infrared:
"...Ua hoʻonui nui ʻia ka pae serum T i ka hui nalu 808nm. I ka hui nalu 670 nm, ua hoʻonui nui ʻia hoʻi ka pae serum T i nā pae testosterone ma ka ikaika like o 360 J/cm2/lā."