Hi and welcome.
I'm in kind of the reverse situation from you. I'm interested in checking things out, but my husband isn't sold on the idea, nor will I do anything to push him. As the others have said, it's not a good idea or the right thing to do. I love him to pieces and he's a wonderful man. We met when we were very young (in our early forties now) and never had others, so now I'm wondering about what it would be like with others. I'm bi-curious and he is aware of this, but isn't terribly interested in us doing anything about it at this time. We talk about things, even visiting a club just to see what it's like, knowing we will not do anything.
From all of my reading here on the SB, I do not see that very many of the ladies have been in this situation. Although, I understand that some have.
We have a wonderful sex life, like you, and he's always been great about trying new things, so I am counting myself as very lucky. He was patient when I went through a rough period where my sex drive was very low, and now that it's really taken off (age I think *S*), he's more than willing to oblige.
Not sure if we'll go further, but perhaps we aren't meant to. Only time will tell. For now, I know I have a wonderful man, a very good marriage, so I'm way ahead of the game. Sounds like you are, too.
Best of luck to you two.
You both sound like good folks!
Indy