I wouldn't find the relationship part of it too difficult for me to handle. The thing is, I wouldn't know about the other people, and being mindful of the person I'm in a relationship with or a certain friend etc. Honestly, certain friends I wouldn't do it with, a lot are guy friends and certain female friends, mainly because of my current relationship with them. I used to believe it would apply to everyone else, but I think if it did happen with a certain friend of mine like that, and I had a threesome with him or her with their friend or gf. Etc, I would be open to it, I wouldn't say no if they came to me asking me, but I wouldn't want to nor would like to ask to. It would come off as awkward later on the few people I am referring to, but not all my friends are like this. A lot of them aren't, it's only a selective few.