Hi
Are there any stories about couples where one of them belongs to a sex club/swingers group but the other doesn't?
For example, they've started dating and she tells him that she belongs to a swingers club and she will keep going there but she's not allowed to invite him in yet, or the rules preclude him from joining in, or there is a time limit before he can join.
TIA.
That sounds like a very niche cuckolding story.
The only stories I'm aware of involve the unwitting husband finding out and taking action:
https://storiesonline.net/s/72304/30-years-of-love-90-days-of-lies
I was thinking more like "We can date if you want, but you must be aware of this. I will understand if you leave".
Closest I can think of is one where both are swingers but they try to hide that from each other - until they meet at a swinger's party.