When a female dog is in heat, she releases a pheromone called Methyl p-hydroxybenzoate that has shown to sexually arouse male dogs that pick up that scent. That's by design, of course — but it can stir up a lot of chaos for you and your canine companion. If an intact male dog catches the scent of a nearby female in heat, she will become his entire focus. Male dogs may stop eating, increase their marking, become increasingly aggressive and obsess over tracking down the female dog in heat throughout the duration of her cycle.
動物王國中也會發生一定頻率的口交。這在靈長類、斑點土狼、山羊和綿羊中都曾觀察到過。母獵豹和母獅子會舔舐並摩擦公獵豹和公獅子的生殖器,這是它們求偶儀式的一部分。短耳犬蝠也以口交而聞名,對它們來說,這有助於延長交配過程,因此能夠增加受孕的概率。
最富建設性的例子可能是對兩隻被關押的公棕熊的一項研究,研究成果今年早些時候發表在期刊《動物生物學》(Zoo Biology)上。在這項為期六年的研究中,研究人員收集了一起生活在克羅地亞一處庇護所圍欄裏的兩隻公棕熊116個小時長的行為觀察記錄,其中包括它們進行的28次口交。
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