My boyfriend of 3 years recently brought up to me that one of his main fantasies would be having a threesome. I'm not sure where I stand on the idea- it sounds awesome from a sexual standpoint, but I'd love to hear from some of you folks who have experienced a threesome with a S/O and what, if any, impacts it had on your relationship. We certainly have an open-minded and sturdy relationship, but I'd love advice before taking any chances with something so precious. Thanks!

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I am certain of nothing but the holiness of the heart's affections and the truth of imagination. What the imagination seizes as beauty must be truth - whether it existed before or not.
-John Keats