I'm gonna assume you were joking about using a trash bag, since they are quite obviously not even airtight...
The fact is that the Condom is the most effective method of contraception yet known, and enjoys an almost 100% success rate. That at least is a fact. STDs that can be transmitted in other ways apart from sex are excluded from the statistics, for obvious reasons...
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Guns don't kill people, People kill people! Using Guns.
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