Threesome twist

My SO and I have been on the topic of threesomes for quite a bit recently. She's talked about letting me have one, sorta like a hall pass before marriage, but she doesn't want to be a part of it. Also we follow each other on Glo and suddenly I see that she has new thoughts of what it'd be like to have one but with me and another dude, in one post even 4 total. If I get a pass, she has one as well. 
How do you feel about this?
Do we never have the 3sum and get a fat dildo and call it a night? 
Do We just have an actual threesome?
She first wanted me to have one because when we started, I told her I wanted one but after being so long together it all stopped but she brang it back up.
I've agreed to many "terms and conditions" of hers and I don't want to cheat, she's amazing to me. 
Curiousity killed the cat? 
Lost in the sauce....help please.

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