Sex trafficking isn't conservative.
However, it's also immoral to confiscate my money and make me pay taxes to stop a behavior which serves no purpose being a criminal act and in no way protects me or my family.
When the country was operating it's first 125 years drugs were not illegal. Was it conservative to make a change to social engineer the use of drugs by outlawing them? And is it conservative to now spend billions keeping taxes higher to punish the use of them?