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about the whole bacteria thing:
your more likely to get some kind of infection from a bj than from anal sex, just simply due to the amount of pathogenic bacteria present there.
yes, the anus does have an insane amount of bacteria in it, but most of those are just mooching around feeding off bits of food and what not in your gut, and arn't to be fussed about. granted, there are some bad guys in there, but a good wash before/after should help sort things out.
as for getting pregnant from anal sex, theres a chance a girl could get pregnant from oral sex if she had an itch, it's all relative.
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