Sentence:  The emotions involved in <WSD>affairs</WSD> can seem like a rollercoaster ride – one moment sublime and exciting, the next full of guilt and confusion. Some people seem to enjoy the drama of these sorts of encounter, relishing the highs and lows. But for most people the experience of an <WSD>affair</WSD> can be difficult to manage - even if the <WSD>affair</WSD> eventually leads to a committed relationship. 
Meaning of the word marked with <WSD> tags:  An adulterous relationship. (from "affaire de cœur").