It is known hands are one of the places on the body with the highest concentrations of germs (right word ?)
Correction, it's actually the Tongue that has the highest concentration of germs..

Anyhow back to Topic, i just usually pull my sleeve up over my hand when ever i use door-=handles etc.
Only because at one stage i was so paranoid that i thought that everything i touched the police were coming in after wards and taking my finger prints..
So now out of habit if anything else i'm always covering my hands when i use things, and if i'm not wearing a jumper with sleeves, then i usually do something to either mess up what ever prints i've left or i just rub 'em of the object..

man i need some proffesional help i think...