Evolution is the propagation of traits of individuals who survived and reproduced and whose offspring survived and reproduced. In a modern developed country sur

Evolution is the propagation of traits of individuals who survived and reproduced and whose offspring survived and reproduced. In a modern developed country survival is less uncertain but reproduction of healthy individuals is actually more uncertain as can be seen by looking at the birth rates in essentially any developed country. As a result, traits that affect certain behaviors, such as underlying desire to reproduce, are likely under more intense selection pressure now than any traits in all of human history.