Well-worded and a gift for aspiring threesome fans, Witt! In my experience (of a dozen or so of them), having that mutual likeability/attraction across all three connections is critical…and is easier said than done (or imagined — to your point). Even as a straight guy in an MMF threesome, I want to find the other fellow comfortable and companionable, and doesn’t freak out by a crossed sword or legs touching. A contrived, lets-make-best-of-it threesome is exactly as you say: an enormous, dissatisfied let down. Practical advice as always!