Jea-lousy

It all sounds like a game to me.
Sorry, I don't mean that as an insult, I really don't.
It is very foreign to me, I tend to remove myself from situations where all the cards are not on the table. I cannot offer any more than I have, other than I truly hope this works out for you. I believe you are a nice person and want your relationship to work.
I just think she is trying to get you to do it while flying blind. She needs to tell you exactly what she wants, expects and how you are supposed to give it to her.
IMO, she does not want to have sex with another man... she want you to react in a way that only she knows. Most likely something involving looking like a Cavalier swordsmen busting down a door, metaphorically.

[Elspode]

Our cards are very much all on the table. The problem is that my cards are in one language, and hers are in another. We do not intepret each other's iconography very well, so to speak. I sometimes make the comparison thusly: Just because your radio doesn't tune to all frequencies doesn't mean that the air isn't teeming with those frequencies. She sees it as me being unable to give things, and I see it as her being unable to receive them. The bad part is, from each individual point of view, both of us are right.

If it is a game, she's the only one playing it. Me, I'm just going with the flow. Even though I'm not 100% on board yet, I do not find the prospect of resuming what was a very enjoyable series of encounters with my lady friend after a four year postponement to be a bad thing by any means. I think that my wife's take on her side of things is fairly similar as far as the actual entertainment value goes. When we are monogamous, we don't have a very good sexual relationship. When we're poly, we almost do each other to death. Does it make sense? Of course not.