| I assume you are talking about what is commonly referred to as an FB.  The W just gets in the way of Fuck Buddies.  
 Now to your question.  The usual thing that happens is that just ONE of the buddies starts wanting more--romance, love, credit cards.  This is the beginning of the end.  Then it's time to find another FB.
 
				__________________Ceterum censeo Carthaginem esse delendam.
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