:Okay, the OED seems waaaaaaaay too slim to pin the move on.  The kissing cousins article surely needs work, but that's the way the term is actually used.  Compare 186,000 Google hits for "kissing cousins,"  84,800 for "kissing cousin," and a mere 6,050 for "cousin couple."  I've never heard of "cousin couple," at least as a phrase. 

 :May I suggest you move it back with db-move, and then propose a move formally if you still feel this is warranted?  If you don't, I will probably request a move back myself.