The guy is a predator and you are a victim. I am sorry for you, it shouldn't have happened. I'm also disappointed in your husband. He let you down when you asked him to stay close. This incident didn't take a minute or two, he took his time. Your husband should have scanned the room for you AND the host, when he didn't see you he should have gone looking. Had he done so, he could have protected you (a husband's PRIME obligation, particularly in this hobby). After you told him the abridged version, he should have asked for details and then he should have de-nutted the host. "Telling on him" to his wife is a cowardly way out. None of this is your fault. That being said, I don't think swinging is for you two because you obviously can't count on your husband to put your comfort and safety ahead of his social activities. Good luck and again, I am so sorry that this happened to you.