在动物界,高等动物也好,低等动物也好,只要一发情,便发出某种信号,召唤异性进行交配。它们的信号,或通过鸣叫发出,或通过气味发出,或以翩翩起舞表达,这些都是直接的,简单而且带有某种固定的本能性质。人类则不同。人是万物之灵,具有丰富的情感和复杂的思维,生活于社会,纵使春心荡漾,发出邀请的性信号,也是间接的,随时 In the animal world, higher animals are better, lower animals are good, and as long as an estrus, they send out some kind of signal to summon the opposite sex to mate. Their signals, either sent by tweets, or scent, or danced, are straightforward, simple, and have some sort of fixed instinct. Humans are different. Man is the soul of all things, rich in emotion and complex thinking, living in the community, even if the spring heart waves, the invitation to send the sex signal is also indirect, at any time