Pierre,
Ok... so I will add "tang" to the dictionary list.

Don't worry my sweetie has given me some fabulous ones, too....
and he often tells me he will "lick my G-spot"! No idea how it's possible!
Still, we are very happy - you said it yourself before, it depends on the dynamic in the relationship. I am sure bringing someone else would cause more problems than the pleasure we would gain. Plus I think part of what turns us on is the exclusivity. We know things about each other no one else does.
Alex,
I did already

Of course I am confident he prefers me to anyone else, no question!
Lady Oscar,
Thank you, I like this suggestion and the way you stated it.
Youdaman,
It's more something to try if we were together just for sex, but since it's something more than this between us. I can do many things with this man because of the level of comfort I have with him. I think it's partially because I feel very secure and I know he is not longing for anything else in the bed. I know it works for some to have an open relationship. But not for us. He's Algerian! I can't even have dinner out of the house if he's not with me, so you can imagine bringing a man or even a woman in the bed is impossible. I'm fine with that!