You obviously (or purposefully) missed my point, so let me try again.
Your point of whether it's the mouth or schlong ignores the fact that you'd be doing more than just touching with the mouth (unless in your particular case you've lost your sense of taste, but that'd be an exception to the norm), therefore you're not presenting an apples to apples comparison.
Also, you just moved the goalpost by introducing bacteria and STDs, which were not any part of the original posts. Stick to your original point, which was that anal sex is more gross than eating ass and a footjob is not gross.
(I believe that should make my point clear so Ilikely won't reply further as I really have no hat in this ring.)