If you were floating in space with only your head in a pressurised helmet, you would die. Your blood vessels would burst, your blood would boil. You would be dead in a few minutes.
I don't know if its a fetish, just so much as DeadSoulXX finding unusual categories to put some of the images he finds in (similar themes and all). On seeing all of these, though, all I can think is: "Good God! The clean up afterwards must be a Beast!!" (you've seen how water looks and acts in zero-g, imagine what Jizz and 'feminine fluids' would act in the same environment ^_^)