Yep, that's because promiscuity causes the spread of diseases and religions figured out that if their followers are sick or die they can't contribute as much. However Christianity is unique in that the ancient Israelite civilization had laws that treated disease like we do now based on science, all given from God above.
Also a big chunk of conservatives are Christians or come from Christian ancestors. In fact most conservative values can be traced back to Christianity and is not found in any other culture or religion.