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1. Is it a bad idea to have a threesome with your long time girlfriend? will it cause problems? jealousy on either end?
There is no magic answer here : it all depends of your relationship. That said, she seems open to the idea and willing to fulfill this fantasy. You should make clear what the expectations are : a one-night threesome, or something with emotional involvement, like some polyamorous may do.
If you go emotional, it may indeed end up with jealousy. Girls are usually more jealous about emotions than just sex (reverse for male). Keep in mind that, depending of your relationship balance, she could perfectly claim to have a MMF threesome. Would you be able to handle this ? Worth talking with her about it.
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2. Will she see this as cheating? or see this as a sign that since I sex with another women she can now have sex with with another guy? or sex with another women?
Not cheating as you talked about it together. Yes for the opening of her partners... And sounds fair, no ?
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3. How do you go about having a threesome? how do I bring this back up to my gf and how do I find a girl who my gf would be comfortable with? I was thinking one of her friends but this could cause problems!
I avoided good friends, because of emotional involvement. And you cannot dump a friend if things do not go well. Try to find out open-minded people. I'd suggest picking someone who is already in an open relationship, to avoid her expecting too much from you. If she's cheating, she will usually not involve herself too much, but it can turn to drama (but you may like drama, can be fun)
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4. Any thing eles I should know about?
Trust is important. Talk to your gf and make things clear about expectations and limits.