Pigs love to live in filth. Sows, in particular, bathe with blissful ignorance and glory within their own excrement and defilement.
Sows like to snort other sows' behinds because they don't concern themselves with how much feces ends up in their snouts. They are simply comfortable living a tainted life, and their grunts betray their guttural core. Though they are lacking in dignity or honor, they live out their days in euphoric heedless gluttony.