If we have survival instincts, why do people commit suicide?  Why do people  sometimes sacrifice their lives?   If we have reproductive instincts, why are some people homosexuals?  Why do some people not want to have children?   These questions seem to some people to disprove evolutionary psychology.  But in fact, they give us some of the best pictures of how people’s feelings come into conflict, and how the decisions people make are the best ways they find to move forward on the combination of motivations they feel.   ACT I Scene 1 [108 bpm] Evolutionary psychology is zoology applied…