My wife LOVES it. The louder he moans the dirtier she gets, the dirtier she gets the louder he moans... its great to watch them feeding off each other.
Once we played with me tied up and blindfolded and all I could do was hear and smell them having sex in front of me... I admitted to them later, that as hot as it was hearing my wife moan I thought I was going to/ wanted to cum hearing him groan. That deep primal guttural groan as he was cumming in her just blew my mind when all I could do was listen to it.