Jesus, this got way off track.
OK, first of all, I would consider it despicable for a gay man to try and blow his female friend's boyfriend behind her back, or to somehow manipulate that situation into happening without regard for the friend's relationship.
I know! I don't understand why people seem to be so offended by the question. TheBF and I were talking about it this morning and neither of us felt offended or like either friend crossed any lines of propriety because of who they were to us and what kind of relationship we have with each other and how it all came up. There was never any kind of feeling of betrayal or coercion, so we're both baffled by some of the negative reactions and insulting assumptions that your OP is generating.
I'm guessing that the people who are expressing a lot of outrage or who are offended must not have friends with whom they talk that openly about sex, so they can't envision how such a conversation might go. I don't have any female friends that talk about sex a lot, so I have a very difficult time imagining how a similar conversation might go with a woman, but I know a lot of men who are really open and comfortable talking about sex explicitly, especially the gay and bisexual ones. The only time I think that a woman has ever suggested anything similar was when a very good friend of mine seriously suggested photographing me and my boyfriend while we had sex together, and I have to be honest, I felt a little bit awkward and surprised by that, but it didn't make me worry that she was an untrustworthy friend, and she never made a move or a pass at my boyfriend. She photographed many people nude, so it's not like we were an exception.
People keep trying to make this an issue about cheating or deception, when it's been my experience that when someone wants to do those things, it involves hiding one's attraction from that person's mate, not being open about it. I was thinking back on all the female friends I've ever had who have attempted to poach my partner, and only one was open with me about how attracted she was to my boyfriend, and that was when we first began dating. She hadn't said a word about finding him sexy in the six months before she threw herself at him.
I don't believe either friend would ever attempt anything behind my back or betray my friendship and if I thought that they would, then we wouldn't be friends!
I had in mind an especially long-lasting, deep friendship between a gay guy and a straight girl, in which they shared intimate details of their sex lives with each other, and the gay guy could admit, with no tension or awkwardness, that were the girl's boyfriend single and willing, he would drop to his knees and suck the boyfriend's cock like there's no tomorrow.
Sometimes I've wondered what might have happened if either guy had been at all bisexually curious. But unless both my female friend and her boyfriend 100% wanted me to suck his cock, I would not have done it.
I understood exactly what you meant.
This describes me and my old friend, who is bisexual but primarily dates men. I didn't share a lot of intimate details of my sex life with him, just some but he shared a lot of details about his sex life with me, which I never minded. While we didn't talk about absolutely everything, there was this comfort level where nothing was really off limits if you wanted to share. There was no such thing as TMI. Obviously he judged the situation correctly because it didn't cause any problems or tension between any of us.
TheBF's friend is the only friend of his whom I've ever talked about sex with like that so intimately, so while we aren't old friends, there was still a high comfort level there.