Great Googly Moogly people. Last season people were saying Charlie was the father of Sun's baby, and now its Michael?? I am all about Lost and theories, but this is just baseless speculation not a theory. I can say that I think Jack is a hermaphrodite, but that doesnt make it a theory it makes it an opinion.
I am not saying it is Michaels. I don't know. I would find it strange that in basically the span of a week, they would seperate, reunite and get it on, then seperate again to the point that Sun tries to poison Jin. Certainly not impossible though.
Also, the doctor told Jin he was infertile. I am not a doctor, so please help me if you know. Does that mean his count is low or something happened to where it basically doesn't exist? If it is the latter, 5 x 0 = 0. Sorry if this is an absurd topic.

Jin's infertility means that the majority of his swimmers don't work. He's shooting blanks, but a couple of them aren't blanks. Out of a normal 60 million, probably about 2,000 or less are good. These never make it to the egg. It isn't impossible to get pregnant, just HIGHLY improbable. However, 2,000 time 5 is 10,000. A much better number. Still pretty low, but at least there's a chance.