<human>: Can you condense the text into a few key points?

Long story short, my normally plain-Jane wife got drunk the other night and confessed she wants to try two guys at once. I was really hoping it was just drunk rambling, but she brought it up again the next day and asked what I thought.

I'm usually the sexually liberal one in the relationship, and am the one that prods her into trying new things and opening herself up to new experiences. However, I am extremely uncomfortable with this. I am absolutely not a fan of bringing other people into our bedroom. It's my one turnoff, and I've felt sick ever since she brought it up. I just can't do it, I keep imagining what it would be like to see her with another guy and it makes my breath catch and my head swim.

I told her I wasn't really comfortable with the idea, but she keeps pressing it and wants me to really think about it. She asked if I would be ok with FFM, and I told her it's no different. She said we could set rules like no kissing, and she would only blow the guy, and there's no emotional or romantic attachment and it's just sex. I still don't think I could emotionally handle seeing her with another guy. I'm afraid it will destroy our marriage in the long run.

So, now I'm stuck between two difficult choices: I can stick to my convictions and refuse, and have her end up resenting me for preventing her from experiencing something she wants to try, or I can give in and risk emotional distraught and a potential dissolving of our relationship. 

I don't know what to do.
<bot>: Wife wants to try MMF threesome and I'm opposed. I can either do it and risk being emotionally scarred, or I can refuse and have her resent me.