Who told you that info?
How old are the two of you?
How long have you been married?
Have either of you ever cheated?
I apologize, I did not see your response, I hope that you will still consider talking with me. You are absolutely right that this behavior is unacceptable. I wonder how he would feel if it were you in the bed and a man with a towel on was talking to you while you're in bed? Perhaps he hasn't looked at it that way. I believe it opens the door for more inappropriate behavior, especially if she does not know how to keep things work related. On the other hand, you have to decide how much you trust your husband, and choose your battles. If you feel strongly about it, of course let him know that this is unacceptable to you, and for him to put the shoe on the other foot and imagine how he would feel and think.
I welcome your thoughts