I'm not squeamish and I have to be around all three of the choices on a daily basis and have been thrown up on more times than I care to remember..
I'm really not looking for intelligent answers about how they are all useful and essential parts of the bodily workings.
For the sake of this question, please presume that the bodily fluids are resourced from a human.
Give your reasons if you like...
My least favourite is vomit, not the texture but the smell.

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