The change of expectation.

So a number of old ass books are interpreted to codemn certain behaviors. Outdated probably. The point is if the conditions that prompted our universal expectations to be what they are here and now. Things Are different now, don't our expectations need to change along with our reality?
Example procreation was necessary to the survival of our species therefore gay was thought of as evil (it would end the species) Now our species is over populated. Is procreation a requirement anymore? Cwrtainly we will survive without it. Ill come up with more examples soon.