Eww! I encounter this way too much at work. The worst is when you can see a damp little finger smudge on the paper(s).
I don’t really find it disgusting, but I also don’t see the need to do it myself.
But I’d like it and find it intriguing if it was a cute girl doing it. 
Oh dear God that’s so funny! Thanks for sharing that!
wipes away tears
When you are my age, you will understand that the palms of your hands stop producing sufficient quantities of oils in old age, and it is nearly impossible for septuagenarian fingers to get purchase on a page.
It is thoroughly disgusting. There are several options to smearing one’s bodily fluids over an absorbent material that others will be handling.