Let's say you are jacking off and want to finger your ass would it be safe to use own pre-cum or could this cause contamination of the ass with bacteria which aren't supposed to be there?Or how about own spit would this be safe?
Is it safe to use own pre-cum as anal lube?
I doubt there would be any problem with either. If they had any bacteria or viruses in them they would probably already be in your gut.
But what if you had bad bacteria in your urethra?
Then they'd get into the ass. I don't know if that would be good.