While the traditional view is that the Bible sets standards, and cultures either follow these standards or don't, the Bible itself shows us that cultural norms and biblical positions shifted in tandem. This does not mean that anything goes; it's simply what we see in the biblical texts themselves. It does not mean that there are no standards; there were always incest taboos, for example, but what counts as incest is culturally dictated, and our society does not embrace many biblical perspectives on this (e.g., the ideal of marrying one's first cousin). It does not mean that God is a pushover; it shows, if anything, a God who will engage people in the world in which they live.
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