i do think that they can be fraught with problems, many of which have alreday been mentioned.
but if i were to be completely 100% honest with myself, i would have to admit that i do have real feelings for a friend, someone other than my SO, and in some ways being able to share that kind of intimacy with them would be much more than just sex.
i still think you can have feelings for and love more than one person. i am not sure if acting on them is a good thing, at least for me.

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