Sorry for the inane thread, but is double dippin' really that bad?
Basically a small fraction of your mouth touches the dipping item, if you put it in again. You're hardly slobbering all over the place.
Sometimes people get a bit too uptight about these health things
What doesn't kill you makes you stronger
edit: that said, i always turn the dipping item around, if i do dip again (so it's on the other edge) and i always get called for the double dip. I think Seinfeld made it too infamous