What is another word for living in sin?
Pronunciation: [lˈɪvɪŋ ɪn sˈɪn] (IPA) 
Living in sin is a phrase often used to refer to a couple who are cohabiting and engaging in sexual relations outside of marriage. However, there are many synonyms for this phrase that provide a more nuanced view of the situation. Some alternatives include "shacking up," "living together," "unmarried cohabitation," and "living in unwedded bliss." Others might use the phrase "unconventional relationship" or simply refer to the couple as "partners." Whatever the terminology used, it's important to respect the individual choices and lifestyles of those around us, rather than judging them based on societal norms or personal beliefs.
