Goldone
[goal-DOAN-ay] Condom.
A more formal word for condom, e.g. if you want to buy one at the pharmacy, is preservativo. This is fraught with peril for foreigners when discussing packaged foods. In such a context, a native English-speaker might instinctively reach for a word for "preservatives," and make a very embarassing mistake: such foods do not contain preservativi, but conservanti. (Although, come to think of it, finding a preservativo in your cereal box could be interesting or disgusting, depending how it's presented...)
BTW, you can usually buy condoms at the supermarket as well - look in the stands near the checkout. And no one will be embarassed if you buy them. They come in all sorts of styles and flavors, there are even brands marketed specifically to youth. Result? Very low rates of teenage pregnancy.

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