May be worth exploring the idea with her indirectly if you aren't sure how she will react. Say nonchalantly that you read (or that a colleague was talking) about people who have sex in groups, but only with each other, etc, and watch her reaction to it, see if she seems curious, or dismissive, etc, and go from there.
I've done this, but I was a bit younger, in a relationship less committed than marriage and everyone was more experimental anyway.
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