Even if Potiphar's (not the king) wife had been a single woman, she was not Joseph's wife to lie with, was she?I think he still would have left.
Let's just be honest here, but tactful. We older folks know full well that when an experienced lady invites a young man into her private quarters there is an implied question. Usually of more than a kiss. I think it just took a younger man a few minutes to figure that out.
I am willing to bet that he will be trying to patch things up with her within the next few weeks.