There is middle ground here. The hypothetical SO is taking a risk and being straight forward, you should at least appreciate that. Assuming good intentions, be glad that your SO wants to do something special for you. r/deadbedrooms has a lot of unhappy people.
I'd want to know why they were interested, and why they thought it was for my pleasure. There might be a way to meet that desire that goes with what you like.
Personally, I'm down with monogamy, so my answer would be "no thanks". But maybe they just want the voyeuristic aspect of it? What about putting some masks on, making a sex tape, and putting it on Pornhub or something?
It's entirely possible you both want different things and are incompatible, but you've got to talk to the other person to see if there might be a way to make everyone hapy.
I'd want to know why they were interested, and why they thought it was for my pleasure. There might be a way to meet that desire that goes with what you like.
Personally, I'm down with monogamy, so my answer would be "no thanks". But maybe they just want the voyeuristic aspect of it? What about putting some masks on, making a sex tape, and putting it on Pornhub or something?
It's entirely possible you both want different things and are incompatible, but you've got to talk to the other person to see if there might be a way to make everyone hapy.