I've shared my gf numerous times, with a number of different men. We stopped seeing any of them around the time of covid lockdown, and we kind of juet lost our momentum and have been planning to ease back into the kink

Even so, it's been completely impossible to forget about the experiences we had. Nearly every time we have sex at some point I'll think about the fact that I've watched other guys in my position, they felt what it was like to thrust into her and press their bodies against hers.

I'll look at her lips and remember watching those wrapped around another man's cock, caressing him until she made him cum in her mouth. To me it is completely impossible to forget those experiences

I was incredibly turned on by all those experiences, and I still am. But I imagine that if you tried this kink out and ultimately decided you did not enjoy it, it would probably be agonizing trying to forget the things you watched another man do with your woman