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i just recently did a research assignment on the different types of condoms and in it i found that polyurethane condoms, may be stronger but they have not yet been proven to protect against STD's or been as successful as latex in protecting against pregnancy.*NB, in my research it said that it has not yet been proven, not saying that it is that way.
they are however not biodegradable as the latex and the ones made by trojan which are lambskin made from the natural membrane of lambskin.
i dont think that keeping a condom in your wallet is too bad just not for too long.
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