Well short of attaching a cat cam to your moggy, you may never know.
Unless of course, you are the owner of the above cheeky puss.
The furry fellow came back with evidence of his extra-curricular trysts attached to his collar.
Explaining his whereabouts, a note attached to his collar reads: 'I'm cheating on you and visiting another house!'
The surprised owners posted the photo online but haven't responded yet.
Amongst the funny suggestions for responses was: 'Send a note back saying: "Yes but he comes home to us at night!"
Cat fight!