I'm somewhat of a germaphobe and so I'm concerned that if I eat my girlfriend out, or she eats me out, and it's been a day since she has (or I have) showered, could we get sick from this? I'm not talking about STDs. I know neither of us has an STD. I'm just worried about the urine or fecal residue that could possibly be ingested if we don't shower right before we do it.
Didn't you know that's how you get cancer?
Of coarse it's always a good idea to shower before doing that, but lets face it ,in the heat of the moment sometimes you can't. so you probably won't get fecal matter in your mouth if you don't head to far south , so don't worry about that! But if your girl isn't clean and your not clean you can get trench mouth,which can be taken care of with guildoxide, Basically if your not filthy you should be fine.
I think your immune system could probably fight off whatever you ingest. But... I would never let a guy go down on me if I hadn't showered that day, or go down on a guy I doubted was clean. A lot of stuff can build up down there for girls, I'd be scared that I smelled bad. And I just don't go near unhygienic guys. Why not go shower together, to eliminate the problem?
If both you are perfectly healthy and taking all hygenic precaution like shower and local cleanig of genitalia and mouth plus have only one and only partner then chances are minimal. Otherwise you will get all possible sickness. You do not have STD that is good.By the way why not to have normal sexual practice instead of worry.