Where do you draw the line? The same place the Bible does. If it is just preference, then it doesn't matter. However, the passages states that those who disobey on this issue are an abomination to God. Trace out the word abomination - where it specifically states something is an abomination to God (not to others - such as shepherds being an abomination to the Egyptians or unclean foods being an abomination to the nation of Israel). Then see if ANY of those abominable things are now acceptable.

Is God now pleased with divorce? Is prostituting your daughters now acceptable? Is the occult now okay to practice? Is it permissable now to commit incest, sodomy, and other kinds of immorality? Does God now want you to pray to Him and offer spiritual sacrifices with a wicked heart? Is pride now considered a good thing? Does God now overlook the using of unjust weights?

Of course, the answer of all of these is no. God's moral nature has not changed - and if something was abominable to Him in the OT - it still is. Trace the word out and see what else He finds abominable.