一般认为,人类和动物的性行为最大的差异是动物有一个发情周期,而人类可以说一年365天,天天都是发情期。然而,严密观察的结果发现,人类也有动物性的发情周期。根据《大自然》杂志发表的一篇美国未婚、已婚妇女的 It is generally believed that the biggest difference between human beings and animals is that animals have a cycle of estrus, while humans can say 365 days a year, every day is estrus. However, close observation revealed that humans also have animal estrus cycles. According to a U.S. unmarried and married woman published in Nature magazine