What all these theories have in common is that same-sex sexual activity is either an accident or a quirky genetic method of helping males impregnate females .
所有这些理论都表明动物的同性行为要么是一场意外,要么是雄性让雌性受孕的狡诈方法。
These true seals have a highly polygynous mating system , with a successful male able to impregnate up to 50 females in one season .
这些无耳海豹是高度一夫多妻制的交配体系,一只胜利的雄性海豹一个季度能够使50只雌性海豹受孕。
Igarap do costa , brazil - along the rivers of the amazon rain forest , people still recount legends in which pink dolphins are magical creatures that can turn into men and impregnate women .