Oh Lord! Very interesting questions.
"...a racist (Lets say you were with someone for a long time but were never in a situation or had a converstation dealing with race, then one day while you were out your significant other verbally berated someone simply because of their race. How would you react and deal with the situation?)"
Wait, this is contingent. It depends upon what situation it is (i.e., whether bf/lover or spouse). If it is a bf, I will try to persuade him. If he is not persuaded, then I will leave him. Of course I wouldn't coerce him. I just think that it is better to end it when the signs are there. I am not married to him, so he owes me nothing and I owe him nothing.
On the other hand, if it is a spouse, then I would attempt to use the power of persuasion to convince him that it is better for him to change his view. But if I cannot successfully persuade him, I will adjust to his belief system. Does this mean that I'll believe what he believes? No. It means that I will let him have his opinion, say little to him on that subject but never compromise my belief system.
"...a porn star (You and the fellas (or the girls) are at a video store looking for a movie to watch on a Saturday nite. One of your buddies stray into the adult video section and a few minutes later he/she runs up to you with a video box with your fiance on the front of it. What would you do?)"
No way, Jose! LOL! I wouldn't take this one at all. Image means a lot to me. The only exception would be if he actually did this during his youthful days, long stopped it before we ever met, and is a great person.
If he's a spouse, then the only exception is the above
and if there are no kids in the picture.
"...a convicted murderer"
This is very difficult. There are many circumstances that could surround a murder. Again, this depends upon what type of relationship. Any bf with such conviction is out the door.
However, if he's a spouse: If the murder is one that is questionable, then I would stand by him. On the other hand, if it is clear without doubt and all circumstances fully pronounced that he was guilty of murder, I would probably let go of him.
".....a skitzofrentic (sp?) (one of my best friends wife has a slight case of skitzophrenia)"
Oh Lord! That's very scary. It reminds me of "A Beautiful Mind".

Uhmmm . . . I have to be honest that I would get scared really fast. I am not honestly someone who can adjust to such. I would only try all of my might and give up all I have for him if I am married to him and he was a great man before the illness came upon him.
"......formerly of the opposite sex"
Oh, I have thought about this one so often. I have a tenacious and affirmative 'no' to this question. Under no circumstance would I stay with such person <period>, not even if we were married. I want what nature has to offer with appreciation, for that is why I don't take any persons I see.
Wow! Those were tough questions. Thanks for posing the questions. Maybe I'll rethink the questions.