in•fi•del•i•ty

Pronunciation: (in"fi-del'i-tE) 
—n., 
—pl. -ties. 
1. marital disloyalty; adultery. 
2. unfaithfulness; disloyalty. 
3. lack of religious faith, esp. Christian faith. 
4. a breach of trust or a disloyal act; transgression.

More than one hundred million people in the United States alone, are affected by infidelity. 

Peter touches on the subject in the Slow, Deep, and Hard release.