She never seems to be available. Maybe just a fantasy?
It's not weird at all to share your mate. Cuckold style relationships are much more common that one might think. I recently reunited with an ex that cuckolded me, and I was more than willing.
She has sex with multiple other partners, mostly with me present, but sometimes I'm not. I get to revel in the details later. I am allowed to wander when she's out of town, as she's gone for up to three weeks at a time for work. That's when I seek massage sessions.
If she told me she was going to run an ad and jerk off a couple hundred random guys I'd be totally down for it.
There's a lot more freaks out there than people think