性交,交配,交尾;
For Darwin, mate choice simply stopped at copulation.
对达尔文来说, 择偶仅仅停留在交尾.
He then made the action of copulation and broke the big stone.
说著就做出交媾的动作,把石头弄破.
Bonobos go the furthest in same-sex bonding with regular copulation among males.
倭黑猩猩在同性关系方面步子迈得更大,他们雄性之间经常交媾.
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