古人面对面交配吗?

Did the ancestors copulate face- to- face?

根据从猿到人面对面交配逐渐增多的趋势,可以推测已灭绝的古人物种已经采用了面对面交配体位。本文以此为基础,探讨了人类特有的所谓的"传教士式"体位的制约、起源及其响应的相关问题。研究认为,由于面对面体位增加了双方的身体接触,会给女性腹侧阴蒂等带来更多的刺激和快感,古人物种因此而越来越频繁地采用了"传教士式"体位,使髋关节等变得越来越灵活,最终促成了直立行走。现代人前置的阴道口、横向扁平卵形的骨盆入口、裸露无毛的身体等都可能与频繁采用这种体位有关。

Itisinferredthatourancestorshadcopulatedface-to-face（ventro-ventralliterally）beforethey diverged from Africa apes,comparing of sexual behavior between apes and modern human.In this paper,the pre-requisite,origin,and adaption of missionary position were discussed,by which hominids could be distinguished from living apes.In my opinion,descendant species should adopt this position more and more frequently,in which the female partners would be more excited for enhanced body contact and clitoris stimulation.Consequently,their＆amp;nbsp;hip joints become flexible and they walked upright.Yet anteriorly positioned vaginal orifice,transversely oval pelvic inlet,and hairlessness in modern human,should be resulted from this position.