My wife and I fantasize a lot about me and a group of guys gangbanging her..

You and your wife are so lucky to have each other. Your wife is the kind of woman who I wish I had met and married in my youth. There is something so erotic about a conservative, intelligent, pretty wife turn into a gang-bang slut. They used her pussy and mouth. Did they also use her butt, maybe a DP?

Sorry jsaltydog for the late reply.
No, that didn't happen.
However, in "our" club the sex she had with two lovers was so passionate that I asked her twice what she would have done if being penetrated anally.
One time she replied with "I thought about it too, so yes" and the other time she said "if you would have put his cock in".
DP's? Yes, in her fantasies.

As for the rest, I feel the same way. I'm very proud of her and happy with her. Our vanilla life is the best you could imagine.
Before we got married, she used to try to make me jealous. For example, she enjoyed it when my university roommate played with her bare breasts and nipples. Especially in front of me.
Some years later, we got married, and for about 25 years, we raised our children.
That doesn't mean there weren't any sexual encounters, but they were rather harmless yet very exciting.
Read, for example, "Black Tie" (copy and paste the link or search for it).

Our life changed completely when once I was fucking her.
She asked me if I ever imagined that I was fucking another woman instead of her.
My honest answer was negative but of course I posed her the same question.
Her too honest answer was yes.
She wouldn't tell me with whom but confessed that she had more men into her mind.
But it took some years more before she became a real HW.
She acted as if this lifestyle were perfectly normal.