女的圆网蜘蛛会在交配时把男蜘蛛吃掉，这男蜘蛛也深知这点，因此只要女的一动弹，他就把生埴器切断留在女的体内逃命。那命根子也不苯，继续喷那鼻涕，造就生命，哈！
Remote copulation: male adaptation to female cannibalism
Daiqin Li1,2,*, Joelyn Oh1, Simona Kralj-Fišer3 and Matjaž Kuntner2,3,4

Biology Letters

Abstract

Sexual cannibalism by females and associated male behaviours may be driven by sexual conflict. One such male behaviour is the eunuch phenomenon in spiders, caused by total genital emasculation, which is a seemingly maladaptive behaviour. Here, we provide the first empirical testing of an adaptive hypothesis to explain this behaviour, the remote copulation, in a highly sexually cannibalistic orb-web spider Nephilengys malabarensis. We demonstrate that sperm transfer continues from the severed male organ into female genitals after the male has been detached from copula. Remote copulation increases the total amount of sperm transferred, and thus probably enhances paternity. We conclude that the mechanism may have evolved in response to sexual cannibalism and female-controlled short copulation duration.

Received December 8, 2011.
Accepted January 11, 2012.
This journal is © 2012 The Royal Society