<human>: Alright so here's the skinny. Been dating for about six years now, its going quite well. 

The problem is I'm a polygamist at heart. I've talked about it with the boyfriend, and he's not exactly keen. We've never had a serious discussion, it's mostly joking and passing comments, but I think its a non-starter for him.

This is where we have the wrench. One of his friends [26 m] is bi, and I don't think he knows. Part of his objection to being with another guy is he doesn't want to sleep with someone he doesn't know. So, my degenerate brain is starting to try and formulate scenarios where I can let him realize his friend (who is pretty cute) could be someone we could both have a bit of fun with.

So, is that how I approach the subject? By letting him know there's a potential option, provided he'd be interested, that he knows? Do I bring it up at all that his friend is bi? Or do I just leave well enough alone?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I'm interested in adding a third, bf isn't as keen; but may be more open if the proposed person is a bi friend he's know for years. Is that how I should approach the topic in a serious manner?