Threesome?

So my girlfriend (1.5 years) has recently told me about her idea to do a threesome, she wants to try two girls and a guy, and maybe if that goes ok, two guys and a girl. I am up for both. The guy option would be a fairly easy one I think, however I have no idea how you would get the third person involved, like, who would you approach? and how would you approach them? Would you go to a hotel (neutral grounds etc)? Have you ever had a threesome? -how did it get arranged etc, and how was it?

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