I travel a lot, one more than one occasion i've rung my wife and can easily tell that she's either sucking someones cock or being fucked - i never say anything and just pretend to not notice her voice tone or other sounds - she knows that i know and like the sexy pretence.
Whenever I fuck a friends wife or girl friend I make sure to shove my dick in their ass. Most times they're into it. But even if they ain't I still shove it right up their ass.