[jcbicouple]

We can understand why your husband would not want another man to have a part of you that you won't allow him to have, as well as why he would not want another man to please you in a way that he can not.
You need to be sympathetic to your partners feelings if you want him to ever consider doing this. (Neither of us would want to share the other one in a way that we wouldn't have each other.) We suggest you take Likeminds suggestions, and try starting with that. You may be surprised to find that with the same patience and tenderness that allowed you to take your husband vaginally, you can take him anally. If you're physically not able to take him, but enjoy the manual stimulation he gives you, he may be more open to the idea of letting someone else enter you from behind, but he needs to know that he can please you in the way you want first.