At "our" club, my wife had a regular lover with a huge cock, in length and girth.
Actually she fell in love with him and from then on they fucked bare.
So beautiful and erotic was to watch them fucking: my wife him or he her.
To see his huge cock disappear in her pussy, to see him penetrating her as deep as possible, as hard as possible while I knew very well how much she liked to be used by him in this way, how she pressed his body to hers, encouraging him to continue, is so erotic that I can find words for it.