I also think Sun was faithful to Jin. I think being in the U.S. where we
have almost no morals left and almost every T.V. show and movie
has all the characters sleeping with every other character, we tend
to forget there are people who are decent and some who actually feel that
extra-marital sex is wrong. I realize Sun was planning to escape from
Jin, but I don't think she would feel that gave her the right to just
hop in the sack with the first man who came along.
I think that worried looked on her face as she was hugging Jin was more
of a "OK, I guess we're doing this." That last happy smile really
convinced me that she is truly happy and has nothing to hide.

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Have a cluckety cluck cluck day.