What do you mean there is zero alternative? For most of the human history, for vast majority of the people, choosing not to have spouse and kids would mean cho

What do you mean there is zero alternative? For most of the human history, for vast majority of the people, choosing not to have spouse and kids would mean choosing not to have sex, e.g. to become a monk. Also, the societal pressure to choose a traditional way of life if you were poor was a lot higher.