I thought the research was that liberals didn't have purity axis of morality (Haidt, is it?).
Haidt's claim is that liberals rely on purity/sacredness relatively less often, but it's still there. Some of the earlier work on the purity axis put heavy emphasis on sex or sin. Since then, Haidt has acknowledged that the difference between liberals and conservatives might even out if you add food or environmental concerns to purity.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.